Does My Pet Have Allergies? Common Signs to Look Out For
Just like people, pets can develop allergies, too. Dogs and cats can react to substances in their environment, ingredients in their food or bites from parasites such as fleas. The signs are not always obvious, however, and what looks like a minor itch can sometimes be the first indication that something is irritating your pet.
We know how uncomfortable persistent itching and skin problems can be for pets. If you have noticed a change in your pet’s skin, coat, ears or behaviour, understanding the common signs of allergies can help you decide when it is time to book an appointment for your pet.
What can pets be allergic to?
Allergies occur when a pet’s immune system overreacts to something that would usually be harmless. These substances are known as allergens.
Pets may be sensitive to a wide range of allergens, including:
- Pollen from trees, grasses and plants
- House dust mites
- Mould spores
- Flea saliva
- Certain food ingredients
- Cleaning products or other environmental substances
Pets’ allergies most commonly affect the skin but can also cause symptoms relating to the digestive or respiratory systems.
1. Frequent scratching or itching
One of the most common signs of an allergy in dogs and cats is persistent itching.
An occasional scratch is perfectly normal, but pay attention if your pet suddenly starts scratching much more frequently than usual. Allergic pets may also lick, nibble or chew at their skin, particularly around their paws, legs, belly or rear end.
Some dogs repeatedly lick their paws when allergies are irritating the skin between their toes. Cats may groom themselves excessively, sometimes to the point that areas of their coat become noticeably thin or bald.
Because itching can also be caused by fleas, mites, infections and other skin conditions, it is important not to assume that an allergy is responsible without veterinary advice.
2. Red, sore or irritated skin
Take a closer look at your pet’s skin if they appear uncomfortable.
Allergies may cause redness, inflammation, spots or irritated patches. In dogs, commonly affected areas include the paws, face, armpits, groin and abdomen. Cats can develop sore, scabby, or crusty areas around the head, neck and other parts of the body.
Continued scratching can damage the skin and make it easier for secondary bacterial or yeast infections to develop. This can make your pet even itchier and may require additional treatment.
If your pet’s skin looks persistently red, inflamed, broken or painful, we advise arranging a veterinary examination.
3. Recurring ear problems
Repeated ear infections can sometimes be associated with allergies, particularly in dogs.
You might notice your dog shaking their head, scratching at their ears or rubbing their face against furniture. Their ears may look red or inflamed, and there may be an unusual smell or discharge.
Treating an ear infection can relieve the immediate discomfort, but if infections keep returning, your vet may want to investigate whether an underlying issue such as an allergy is contributing to the problem.
Cats can develop itchy or inflamed ears too, although parasites and other conditions can produce similar symptoms.
4. Excessive paw licking or chewing
Constant attention to the paws is another sign worth watching for in dogs.
Environmental allergens such as pollen can come into contact with a dog’s feet while they are walking outdoors. Affected dogs may lick or chew their paws after walks, and the skin between their toes can become red and sore.
While cleaning your dog’s paws after a walk may sometimes help reduce contact with environmental irritants, persistent licking should be investigated. Paw problems can also result from foreign bodies, injuries, infections and parasites.
5. Hair loss or changes to the coat
Allergic pets do not necessarily lose hair directly because of their allergy. Instead, repeated scratching, licking and grooming can gradually damage the coat.
You may notice bald patches, thinning fur or areas where the coat looks broken or uneven.
Cats can be particularly good at hiding how itchy they are. Rather than seeing your cat scratch, you may first notice that their belly, legs or sides have become unusually thinhaired because they have been grooming excessively.
Any unexplained hair loss deserves veterinary attention, as allergies are only one of several possible causes.
6. Digestive problems
Food allergies can sometimes cause digestive signs in dogs and cats, although gastrointestinal symptoms can have many other causes too.
Possible signs include vomiting, diarrhoea or frequent bowel movements. Some pets with food-related allergies primarily experience itchy skin rather than digestive problems, while others may have a combination of symptoms.
If a food allergy is suspected, your vet may recommend a carefully controlled elimination diet. Simply changing foods repeatedly can make it more difficult to identify the problem, so always seek veterinary guidance before beginning a dietary trial.
7. Sneezing, coughing or watery eyes
Although skin problems are among the most familiar allergy symptoms in dogs and cats, some pets can develop signs involving their eyes or their respiratory system.
You might notice sneezing, watery eyes or irritation around the face. Cats in particular can experience respiratory symptoms for many different reasons, so persistent sneezing, coughing, wheezing or breathing changes should never automatically be assumed to be an allergy.
Breathing difficulty requires prompt veterinary attention.
Could it be fleas?
Flea allergy is an important possibility whenever a pet is persistently itchy.
Some dogs and cats are allergic to flea saliva and can experience considerable irritation after only a small number of bites. You may therefore not see large numbers of fleas even when flea allergy is contributing to the problem.
Keeping flea prevention up to date is an important part of protecting your pet’s skin and general wellbeing. We can recommend parasite protection appropriate for your pet.
How are pet allergies diagnosed?
Unfortunately, there is not always one simple test that explains why a pet is itchy.
Your vet will usually begin by taking a history and examining your pet’s skin, coat and ears. They may need to rule out other common causes such as fleas, mites or infection before investigating allergies further.
Depending on your pet’s symptoms, additional tests, treatment trials or a specialist elimination diet may be recommended. Allergies are often managed rather than permanently cured, so finding the right approach may take time.
When should I contact my vet?
Book an appointment if your pet is persistently scratching, licking or chewing themselves, develops recurring ear or skin problems, has unexplained hair loss, or seems uncomfortable.
The earlier the cause is investigated, the sooner steps can be taken to relieve irritation and reduce the risk of secondary infections.
