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Even when they are looked after with the greatest care, pet rabbits remain remarkably vulnerable to a wide range of parasites. Internal and external alike, these unwelcome guests pose a serious threat to a rabbit’s health: they can cause chronic digestive disease, neurological damage and, in the worst cases, death.

Every responsible owner benefits from understanding how the commonest parasites live, how they are detected and — most importantly — how infection can be prevented in the first place. This guide is a thorough reference on parasitic diseases in rabbits.

Internal parasites: a quiet and insidious enemy

Internal parasites are among the greatest challenges in rabbit care. Their presence is often difficult to spot until the infection has reached an advanced stage.

Coccidiosis

Coccidiosis is one of the most common and most life-threatening diseases of young rabbits. It is caused by protozoa of the genus Eimeria. Rabbits may be infected by several species, which attack either the intestines (the intestinal form, the more common of the two) or the liver (the hepatic form, which is rarer).

Infection occurs when a rabbit ingests oocysts shed in the faeces. The oocysts become infective within 24–48 hours and are extremely resistant to ordinary cleaning products. In young animals the signs come on rapidly and include severe watery or mucoid diarrhoea, lethargy, abdominal bloating, loss of appetite and rapid weight loss. The hepatic form leads to an enlarged liver and jaundice. Treatment calls for prompt administration of coccidiostats, often alongside supportive care such as rehydration and a change of diet.

Encephalitozoonosis

This is one of the most insidious diseases of all, frequently misdiagnosed or missed altogether. It is caused by a microscopic protozoan, Encephalitozoon cuniculi. The parasite targets mainly the nervous system (the brain) and the kidneys, and it can also colonise the lens of the eye. In most rabbits the infection is asymptomatic. When it does flare up, the signs are neurological: a head tilt (torticollis), nystagmus, ataxia (loss of coordination), seizures or paralysis. Other signs include kidney failure and ocular changes such as uveitis or cataract. Treatment involves giving fenbendazole over several weeks in order to curb the parasite’s replication and calm the inflammation.

External parasites: skin problems you can see

External parasites are either visible to the naked eye or announce themselves through obvious skin changes that an owner can easily notice while grooming.

Ear mange

This is the commonest parasitic skin problem in rabbits, caused by mites (Psoroptes cuniculi). It shows up as intense itching of the ears, head shaking and scratching. Thick, brown, flaking crusts resembling a shell build up inside the ear canal. Left untreated, ear mange is extremely painful, can lead to secondary bacterial infection and, in advanced cases, to a ruptured eardrum and neurological signs such as a head tilt. Treatment requires topical and systemic antiparasitic medication, for example selamectin or ivermectin as a spot-on. Never pick the crusts off yourself — you risk damaging the delicate ear canal.

Sarcoptic mites, cheyletiellosis, lice and fleas

Other mites call for treatment too. Burrowing mange mites (Sarcoptes/Notoedres) cause intense itching, hair loss and thickened skin, most often on the nose, lips and toes. Cheyletiellosis (Cheyletiella parasitovorax), on the other hand, is recognised by its “walking dandruff”: the mites move about beneath a layer of flaking skin, usually along the back. Lice and fleas are less common in rabbits than in dogs or cats, but they do occur. They need prompt treatment with suitable products — and you must never use preparations intended for dogs or cats without veterinary advice.

Diagnosis: the foundation of effective treatment

Getting the diagnosis right is crucial, because the signs of parasitic disease — the neurological and digestive ones in particular — are often non-specific. To reach an accurate diagnosis, a veterinarian uses the following laboratory methods:

Diagnostic method	Purpose of the test
Faecal examination	Detecting coccidial oocysts and the eggs of roundworms and tapeworms.
Blood test	Detecting antibodies against the protozoan Encephalitozoon cuniculi.
Skin scrapings	Identifying mites (mange mites, Cheyletiella).

A faecal examination means analysing samples under the microscope using flotation or a direct smear. A blood test shows whether the rabbit has been exposed to the protozoan, and a high antibody titre points to an active infection or a high risk of one developing. A skin scraping involves taking a small sample of surface skin and hair and examining it under the microscope to identify mites.

Prevention and routine care

The best defence against parasites is prevention. Rabbits are highly sensitive to change and to stress, both of which can wake up a dormant infection.

The essentials of prevention:

1. Environmental hygiene. Remove droppings and urine daily and change the bedding and hay regularly. Washing the hutch is not enough to disinfect against coccidia, whose oocysts are exceptionally tough. Use steam cleaning or specialist coccidiocidal products.
2. Quarantine and check-ups. Every newly acquired rabbit must spend at least three to four weeks in strict isolation from the rabbits already at home. Newcomers should have a faecal examination and a test for encephalitozoonosis, and preventive worming with fenbendazole is often recommended.
3. Diet and stress. Unlimited access to hay supports gut health and natural immunity. Keeping stress to a minimum matters enormously, since stress lowers immunity and allows latent disease to flare up.

The most common mistakes

Owners often make a handful of significant mistakes that can undo all the treatment and prevention:

• Using the wrong medication — for example products made for dogs or cats, which are toxic to rabbits (fipronil among them).
• Disinfecting incorrectly: if the product is not effective against coccidial oocysts, the disease returns quickly.
• Ignoring the environment — treating only the animal while leaving the hutch and accessories undisinfected.
• Stopping treatment too soon, which leaves the parasite alive.

Questions and answers

Responsible care depends on reliable information, so here are the answers to the questions we are asked most often:

• Does my rabbit need preventive worming? Worming is recommended for rabbits that go outdoors, mix with other animals or come from an unknown source. Oral fenbendazole is the usual choice, given preventively against encephalitozoonosis and certain roundworms. Always make the decision after talking it through with your veterinarian.
• Can I use flea products made for dogs or cats? Absolutely not. Many popular products are lethally toxic to rabbits. Use only what has been recommended by a veterinarian experienced in treating rabbits.
• How do I disinfect the hutch after coccidiosis? Clean the hutch thoroughly and disinfect it with products active against oocysts (sodium hypochlorite bleach solutions, for instance, or specialist coccidiocidal preparations). Be sure to rinse and dry the hutch completely before the rabbit goes back in.

For many of us winter means beautiful landscapes and playing in the snow. For our four-legged friends, though, it can be a real challenge — especially when it comes to protecting their paws. Caring for and protecting a dog’s paws through the winter months matters not only for their comfort but, above all, for their health. Low temperatures, ice, damp and chemical de-icers such as the salt spread on pavements can all lead to irritation, cracking and even frostbite. In this article, put together by the experts at Zviropolis, we look at why winter paw care is so important and at the practical steps you can take to keep your pet safe and comfortable on walks in cold weather.

In a nutshell: the key rules of winter paw care

Protecting your dog’s paws in winter is essential if you want to prevent the skin irritation and frostbite caused by low temperatures and road salt.

• Avoid walking on salted pavements – choose routes through parks or untreated paths, which cuts the risk of irritation.
• Keep walks short on very cold days, but go out more often, so your dog still gets the exercise without the risk of frostbite.
• Rinse the paws after every walk! Use lukewarm water to wash away every trace of salt, ice and chemicals.
• Use specialist balms before and after the walk – a conditioning one before you head out and a restorative one once you are back home.
• Protective boots can work well for winter walks, but not every dog will accept them – get your pet used to them gradually and choose a model with a non-slip sole.
• Do not apply petroleum jelly before a walk, as it can increase the risk of frostbite; wax- or paraffin-based products are the better choice.
• Check your dog’s paws regularly – any redness or cracking needs to be treated straight away.
• Trim the hair between the paw pads so that snow and ice cannot pack into hard, painful balls.

Why winter paw protection matters so much: how the damage happens

Protecting a dog’s paws in winter is extremely important, because low temperatures and the salt spread on pavements can cause a whole series of health problems for our four-legged friends.

Urban hazards: road salt and frost

The greatest enemy of a dog’s paws in winter is road salt (sodium chloride and other de-icing mixtures). Salt dries out the delicate skin of the pads and robs it of its elasticity, which leads to cracked pads, a burning sensation and severe irritation. On winter walks dogs are exposed to skin irritation that can end in cracked paw pads.

What is more, when a dog licks its paws to ease the discomfort, it may swallow those chemicals, which in turn causes stomach problems.

Frostbite is another problem that can arise when a dog spends too long out in the cold. Extreme cold and prolonged contact with ice or snow can cause frostbite, particularly around the edges of the paws and between the toes. It shows up as a change in the colour of the skin on the paws and as swelling, which makes walking painful and uncomfortable. The skin may turn pale or bluish and, in more severe cases, black, with a loss of sensation.

Looking after your dog’s paws in winter is key to their health and comfort. A few simple rules will help you avoid the problems that come with winter walks:

• Avoid salted pavements – pick walking routes where salt is not used.
• Keep walks short on very cold days – several short outings are better than one long one.
• Care for the paws after every walk – wash them in lukewarm water and dry them thoroughly.

Sticking to these habits will keep your dog’s paws in good condition all winter long and keep them comfortable and healthy during their daily time outdoors.

Proper paw care: the golden rule for coming home

When caring for your dog’s paws in winter, there are a few key points worth bearing in mind that will keep your pet comfortable and healthy on walks in low temperatures.

The golden rule: after every walk the paws must be cleaned immediately and thoroughly. Simply wiping them is not enough!

How to wash and dry the paws

1. Rinsing: first and foremost, after every walk wash your dog’s paws thoroughly in lukewarm water (never hot!) to remove any residue of salt, ice and other chemicals that can irritate the skin. Take particular care to rinse between the toes.
2. Drying: next, gently but thoroughly dry the paws with a towel. Pay special attention to drying between the toes, because moisture left there encourages inflammation.

Coat care and moisturising

It is then worth applying a moisturising balm or ointment to help the pads recover and protect them from cracking. Massage balm or ointment into the pads regularly, ideally at bedtime, to keep them supple and crack-free.

Important: remember to trim the hair between the paw pads regularly. Hair that is too long collects ice and snow into balls that injure the paw.

On frosty days it is worth cutting down the time spent outdoors but going out more often. That way your dog still gets to move about without any risk of frostbite.

Step	What to do	Expert tip
Rinsing	Wash your dog’s paws straight away.	Use lukewarm water (never hot!) to remove salt, ice and chemicals effectively. Take particular care to rinse between the toes (a dedicated jug or bowl makes this easier).
Drying	Dry the paws thoroughly after washing.	Gently but thoroughly dry the paws with a towel. Moisture left between the toes encourages inflammation, which is why this step matters so much.
Coat care	Remove anything that could cause injury.	Trim the hair growing between the paw pads regularly. Hair that is too long collects ice and snow into hard, sharp balls that damage the skin mechanically.

Protection from the outside: waxes, balms and boots

Protecting your dog’s paws on winter walks is extremely important. There is a wide range of products on the market that can help shield them from harsh weather.

Choosing a protective product (before the walk)

Choosing the right product for your dog’s paws in winter is key to keeping them comfortable and protected from the weather.

• Protective waxes and paraffin: wax-based products form a transparent, protective film on the surface of the paw that keeps moisture and salt out. Apply the wax before every outing and massage it into the pads and the spaces between the toes. Paraffin-based preparations form a protective film too.
• Lanolin and propolis: before heading outdoors it is worth reaching for lanolin or propolis, which condition the skin and shield it from the cold.
• Petroleum jelly: petroleum-jelly-based ointments are worth a look, as they moisturise and repair the skin beautifully — but they are not recommended before a walk, since they can increase the risk of frostbite. Use petroleum jelly after the walk, to help the skin recover.
• Restorative ointments: ointments containing vitamins A and E are excellent for repairing the skin after a walk, once the paws have been washed and dried, and help cracked skin heal.

Protective boots

One popular solution is a set of protective boots. Their main advantage is that they insulate the paw effectively from cold ground and shield it from the damaging effects of road salt.

• Tips on boots: bear in mind that not every dog will accept wearing boots, which can be a challenge for owners. To get your pet used to their new footwear, start with short sessions indoors and gradually extend the wearing time. It is also worth checking how well the boots are made, how well they fit your dog’s paw, and whether the sole is non-slip.

Common mistakes and first aid

Dog owners often make mistakes when caring for their pets’ paws in winter, and those mistakes can have unpleasant health consequences.

Mistakes to avoid

• Skipping the paw wash after a walk: once you are back home, rinse your dog’s paws thoroughly in lukewarm water to remove any residue of salt and other chemicals that can cause irritation.
• Using the wrong product on the paws: reaching for petroleum jelly before a walk instead of a wax-based balm.
• Not checking the paws: their condition should be checked regularly – any redness or cracking needs to be treated straight away.
• Neglecting the coat: the hair between the pads needs trimming.

First aid for frostbite

If you notice signs of frostbite (the paws feel hard or look pale, or your dog is limping), cut the walk short immediately and:

1. Warm the paws gradually with warm water or a warm, dry towel (never with hot water!).
2. Do not rub the frostbitten areas.
3. If the irritation is severe, the cracks are deep, or you suspect frostbite – be sure to contact our veterinary clinic.

Summary and what to do next

Winter is the season when we have to take particular care of our four-legged friends’ health and comfort. Low temperatures and the salt on pavements can leave dogs with irritated, cracked paw pads.

The key is proactive protection (waxes or boots) combined with disciplined aftercare (rinsing in lukewarm water and drying thoroughly). With the right routine and a watchful eye, you can keep your dog healthy and comfortable even on the coldest days.

If, however, you notice severe irritation, deep cracks or signs of frostbite in your pet, please get in touch with our veterinary clinic. Our specialists will provide expert care so that your dog is soon back to full activity.

FAQ

Do dogs need protective boots in winter?

Protective boots can be very helpful for dogs, especially those that spend a lot of time outdoors in winter conditions. They shield the paws from cold, road salt and sharp surfaces. Not every dog will accept boots, though, so it is worth introducing this kind of protection gradually.

What are the signs of frostbite in a dog?

Frostbite in a dog can show up as a change in the colour of the skin on the paws, swelling and pain when walking. The skin may turn pale or bluish. If you notice any of these signs, consult a veterinarian as soon as possible.

Is road salt harmful to dogs?

Road salt can be harmful to dogs, as it irritates their skin and can lead to cracked paw pads. On top of that, if a dog licks its paws after a walk it may ingest the salt, which is dangerous to its health. That is why washing the paws after every walk is so important.

Which balms are best to use before a walk?

Before a walk it is worth using a conditioning balm based on wax or paraffin. These form a protective barrier on the dog’s paws, shielding them from moisture and road salt. Avoid petroleum jelly before heading out into the frost, as it can increase the risk of frostbite.

Can household remedies be used to care for a dog’s paws?

Yes, household remedies such as coconut oil or olive oil can be used as natural conditioners for a dog’s paws. That said, always make sure your dog is not allergic to any of the ingredients and watch how the skin reacts after you apply them.

How often should I check my dog’s paws in winter?

We recommend checking your dog’s paws after every winter walk. Look out for any redness, cracking or other changes to the skin, and act immediately if you find any.

Are there dog-safe alternatives to road salt?

Yes, there are alternatives to road salt that are safer for dogs. You can use sand or the special eco-friendly grits sold in pet shops and garden centres.

A drooping eyelid, a visible third eyelid and a smaller pupil — this combination of asymmetrical eye signs can be very alarming for an owner. It often appears suddenly and is a clear neurological signal. The condition is known as Horner’s syndrome and, while it is not usually painful in itself and does not threaten sight, it is the clinical reflection of another, sometimes serious, underlying disease. Prompt, precise diagnosis is essential to establish the primary cause, start the right treatment and give your pet the best possible care.

Below we explain what Horner’s syndrome is, why it develops, how advanced diagnostic work-up proceeds and what the treatment options are. The aim is to provide sound, expert information that will help you understand the problem and work through the diagnostic process under a veterinarian’s guidance, with a sense of calm and control over the situation.

What is Horner’s syndrome?

Horner’s syndrome (also called Claude Bernard-Horner syndrome) is a set of ocular signs that appear as a result of damage to or interruption of the sympathetic nerve fibres supplying the eyeball and the surrounding muscles.

A simple definition:

Horner’s syndrome is a set of characteristic, asymmetrical signs around the eye (a constricted pupil and a drooping eyelid among them) caused by the loss of tone in muscles controlled by the damaged sympathetic system. It is a neurological disorder.

Briefly, on the role of the sympathetic system in the eye. The sympathetic system is part of the autonomic nervous system and works outside conscious control. In the eye, its fibres govern several key functions:

• Dilating the pupil.
• Holding the upper eyelid in its normal, raised position.
• Holding the eyeball in its proper position within the orbit.

When the sympathetic fibres are damaged, their action stops and the intact parasympathetic system takes over. The muscles slacken and the clinical signs appear, among them a constricted pupil (miosis).

What do the signs of Horner’s syndrome look like in dogs and cats?

The signs of Horner’s syndrome are one-sided and very distinctive.

The main ocular signs, plus the additional ones:

• Constricted pupil (miosis): the pupil in the affected eye is smaller (anisocoria). This is the most noticeable of the signs of Horner’s syndrome in a dog or cat.
• Drooping upper eyelid (ptosis): the lid hangs down, so the eye looks half closed.
• Sunken eyeball (enophthalmos): the eye appears drawn back into the orbit.
• Protrusion of the third eyelid: because the eyeball has receded, the nictitating membrane becomes more visible.

The signs in brief:

• Miosis: a constricted pupil.
• Ptosis: a drooping upper eyelid.
• Enophthalmos: a sunken eyeball and a protruding third eyelid.

Additional vascular and neurological signs:

• Dilation of the skin’s blood vessels (vasodilatatio): a local rise in skin temperature on the face.
• Others: a temporary drop in intraocular pressure, or accompanying paresis of a forelimb when the problem lies in the spinal cord.

Why does Horner’s syndrome develop? The commonest causes

Horner’s syndrome is acquired. It results from damage along the long and complicated route taken by the sympathetic fibres, which runs from the brain through the spinal cord, the chest, the neck and the middle ear before finally reaching the eye. That extended path leaves the fibres vulnerable to injury and to pressure from neighbouring structures such as tumours or abscesses.

Damage anywhere along this route interrupts the nerve signal. The muscles that depend on the sympathetic system are then left without stimulation, they slacken, and the signs appear.

Classification by site of the lesion

Where the sympathetic neuron is damaged determines how severe the condition is and how it progresses.

• Central (first-order neuron):
  • Site: covers the first neuron, from the hypothalamus through the brainstem to the spinal cord (T1-T3).
  • Example causes: intracranial disease, damage to the cervical spinal cord, endocrine disorders such as diabetes mellitus and hypothyroidism.
• Preganglionic (second-order neuron):
  • Site: covers the second neuron, running through the chest and neck as far as the cranial cervical ganglion.
  • Example causes: tumours in the chest (mediastinal lymphosarcoma in cats, for instance), changes in the mediastinal lymph nodes, injuries to the brachial plexus.
• Postganglionic (third-order neuron):
  • Site: covers the third neuron, which leaves the cranial cervical ganglion and passes through the middle ear to the eyeball.
  • Example causes: this is the commonest form. Middle or inner ear infections. Injuries and bite wounds to the head and neck. Retrobulbar abscesses.

Idiopathic cases

In a large proportion of dogs and cats no specific primary cause can be found. These cases are classified as idiopathic Horner’s syndrome.

• It is the commonest cause of all (particularly in Golden Retrievers and Cocker Spaniels).
• The prognosis is usually good.

Is Horner’s syndrome dangerous?

Horner’s syndrome in itself poses no danger to the eye. What is dangerous is the underlying disease it may be signalling. It tells us that nerve conduction has been interrupted somewhere, and that can be linked to serious conditions such as tumours or spinal cord injuries.

Checklist: when not to wait. An urgent veterinary appointment is essential, especially where the eye signs are accompanied by:

• Neurological signs such as paresis or paralysis of the limbs.
• Difficulty walking or keeping balance, or a head tilt.
• Respiratory signs (laboured breathing) associated with tumours in the chest.
• Fresh wounds, injuries or obvious pain in the head or neck.
• General signs pointing to endocrine disease.

Horner’s syndrome in cats and dogs — what does the work-up involve?

The aim of the work-up is not merely to confirm the set of signs, but above all to locate the lesion and identify its primary cause.

Clinical and ophthalmic examination

The process starts with a detailed history and a clinical and neuro-ophthalmic examination.

• Assessing the signs: confirming by eye that the classic signs are present.
• Distinguishing it from other eye conditions: anterior uveitis (uveitis anterior) has to be considered.

Pharmacological testing

Pharmacological tests using drops (sympathomimetics) are the principal tool for localising the lesion.

• Phenylephrine 10%: the pupil of the affected eye dilates within 5-8 minutes if the lesion involves the postganglionic neuron (third-order). If dilation takes around 40 minutes, that points to damage to a preganglionic neuron (first- or second-order).
• Adrenaline 0.1%: dilates the pupil of the affected eye within 20 minutes if the postganglionic neuron is the one damaged.

Further investigations

Imaging and laboratory tests are needed to rule out serious disease and pinpoint the lesion.

Which tests are run depends on what is suspected:

• Otoscopy: to assess the middle ear.
• Neurological examination: particularly where a first- or second-order neuron lesion is suspected.
• Radiographs of the chest and cervical spine: needed to rule out tumours and bony changes.
  • In cats, chest radiographs are recommended as a matter of routine.
• Magnetic resonance imaging (MRI) or computed tomography (CT): advanced imaging, recommended in complicated cases.
• Blood tests (haematology, biochemistry, thyroid hormones): these rule out a metabolic or endocrine background.

Treating Horner’s syndrome

Treatment of Horner’s syndrome depends entirely on the cause that is found.

Treating the cause

This means dealing with the underlying disease:

• Treating an ear infection (with antibiotics, for example).
• Surgery (removing a tumour, dealing with retrobulbar abscesses).
• Treating endocrine disease.

Where the problem lies in the preganglionic neurons, treatment has to address the cause.

Symptomatic treatment (when no cause can be found)

This is used in idiopathic cases, or where the cause cannot be removed.

• Phenylephrine drops: used for symptomatic relief. As a sympathomimetic, phenylephrine supports the local action of the sympathetic supply.
  • Its effect lifts the drooping eyelid, draws back the third eyelid and dilates the pupil.
  • The drops are usually given 1-2 times a day for 6-8 weeks.
• Acupuncture: there are reports of a beneficial effect in idiopathic cases.
• Ophthalmic monitoring: essential for keeping track of the patient’s progress.

Prognosis — when does Horner’s syndrome resolve?

The prognosis depends entirely on where the lesion sits and on whether the underlying disease can be treated successfully.

• Postganglionic lesions (third-order neuron): the prognosis is generally good. In idiopathic cases the signs resolve on their own within 4 to 8 weeks, occasionally taking up to 4 months.
• Preganglionic lesions (first- and second-order neurons): the prognosis is guarded to poor, because these are often bound up with serious disease of the brain or spinal cord, or with tumours.

What matters most is getting to a veterinarian quickly to establish whether Horner’s syndrome is signalling something more serious.

If you notice anything worrying in your pet, or you would like to book a vaccination appointment, please contact one of the Zviropolis veterinary practices without delay:

• Zviropolis Wilanów ul. Sejmu Czteroletniego 2/172 02-972 Warszawa
• Zviropolis Ochota ul. Włodarzewska 87 lok. U2 02-393 Warszawa
• Zviropolis Praga-Północ ul. Białostocka 5 03-741 Warszawa

Contact number (all locations): +48 602 525 050

In summary

Horner’s syndrome in dogs and cats is a neurological phenomenon that gives a clear, if asymmetrical, signal around the eyes. Although in many cases it turns out to be idiopathic and resolves on its own, a full and thorough work-up is still necessary to rule out primary conditions serious enough to threaten a pet’s health, and even its life. Locating the nerve lesion and identifying the cause is the only route to effective treatment.

If you notice your animal suddenly develop a drooping eyelid, a constricted pupil or a protruding third eyelid, do not put it off. The best step you can take is to get quickly to a professional veterinary clinic, where specialists in ophthalmology, neurology and internal medicine can carry out a full clinical examination, pharmacological tests and any imaging required, so the problem can be located quickly and the right treatment begun.

Owners’ most common questions (FAQ)

Does Horner’s syndrome hurt? No, the set of eye signs itself (drooping lid, smaller pupil) is not painful. Pain may, however, come from the primary cause — an ear infection or an abscess, for example.

Can the dog or cat still see normally? As a rule, Horner’s syndrome does not affect vision. The exception is when the third eyelid covers a substantial part of the eye.

Can the signs come back? If the Horner’s syndrome was idiopathic, recurrence is rare. If the primary cause (a tumour or a chronic endocrine disease, say) has not been fully resolved, however, the signs can return.

Can it be treated at home? Home treatment is possible only after a thorough work-up and under close veterinary supervision. Symptomatic treatment (drops) should not be used until serious causes have been ruled out.

Is Horner’s syndrome dangerous? The signs themselves pose no danger to the eye, but the syndrome is potentially dangerous as a signal of a more serious disease that may threaten the animal’s life.

How long does treatment take? Treatment is lengthy and depends on the cause. With idiopathic Horner’s syndrome the signs resolve on their own within 6-8 weeks. Full recovery may take several months.

Which breeds are most at risk? Among dogs, a higher incidence is seen in breeds such as the Golden Retriever and the Cocker Spaniel.

Can Horner’s syndrome affect both eyes? Although it happens very rarely, the signs of Horner’s syndrome are usually one-sided. There is, however, a separate condition — Haw’s syndrome — in which cats develop protrusion of both third eyelids.