Can Dogs Be Allergic to Cats?

Dogs can develop allergies to many things in their environment, from pollen and dust mites to certain foods. And if you have a dog and a cat in your home, it raises an interesting question: can dogs be allergic to cats?

The answer is yes, although a dog being truly allergic to a cat itself is relatively uncommon. More often, a dog reacts to substances associated with the cat, such as proteins found in dander, saliva, or urine. These allergens can become airborne or settle on furniture, bedding, carpets, and even your dog's fur.

It’s important to figure out what is triggering your dog’s allergies to determine whether something in your cat’s environment could be contributing to the problem.

Can Dogs Really Be Allergic to Cats?

Dogs can have an allergic reaction to the proteins that are produced by cats. These proteins occur in substances such as skin flakes, saliva, and urine. When a cat grooms himself, saliva containing these proteins spreads across his or her coat. As the saliva dries, allergen-containing particles can become part of the household dust.

A dog that reacts to these proteins may develop symptoms after spending time around a cat or in an environment where the cats live. However, veterinarians often consider other environmental allergies first because dogs commonly react to pollen, mold, dust mites, and other allergens.

Therefore, while cat allergies in dogs are possible, they aren't among the most common causes of allergic symptoms.

What Causes a Cat Allergy in Dogs?

The biggest misconception about pet allergies is that the allergy comes from the animal's fur. Fur itself usually isn't the allergen. Instead, a dog’s immune system reacts to specific proteins found in substances such as dander and saliva.

Cats constantly shed tiny flakes of skin, otherwise known as dander. These particles can circulate throughout the home and stick to furniture, carpets, clothing, and bedding. When a cat grooms, saliva also deposits allergenic proteins onto the fur.

Your dog can encounter these allergens by breathing them in, getting them on his or her skin, or coming into direct contact with an allergen-covered surface.

What Are the Symptoms of a Dog Allergy to Cats?

If a dog is allergic to a cat, he or she could develop symptoms that look very similar to other environmental allergies. Itchy skin tends to be one of the most noticeable signs. Your dog may scratch, lick, chew, or rub certain areas of the body more frequently than usual.

Some dogs may also develop red or irritated skin, recurring ear problems, excessive paw licking, or hair loss caused by persistent scratching and licking.

Respiratory symptoms can occur too, although skin-related symptoms are generally more common in dogs with allergies. Sneezing, watery eyes, nasal discharge, or coughing could potentially occur after exposure to an allergen.

Because these symptoms overlap with many other conditions, you can't determine the cause simply by looking at your dog's symptoms.

Can Dogs Develop Allergies From Living With Cats?

A dog doesn't necessarily need to have an immediate reaction the first time it encounters a cat. Allergies involve the immune system, and repeated exposure can sometimes make the source of an allergen more noticeable over time.

Your dog may live comfortably with a cat for years and then develop allergy symptoms for an entirely different reason. For example, seasonal allergies can suddenly become more obvious during certain times of the year, making it easy to assume that the cat is responsible. This makes identifying the actual trigger especially important.

How Can You Tell If Your Dog Is Allergic to Your Cat?

Figuring out whether your cat is causing your dog's allergy can be challenging because dogs encounter so many potential allergens every day. A veterinarian will usually consider your dog's symptoms, medical history, environment, and other possible causes.

If your dog develops symptoms shortly after moving into a home with a cat, or symptoms consistently become worse after spending time around cats, that information can help your veterinarian investigate the possibility of a cat-related allergy.

Veterinary allergy testing may also help identify environmental allergens. However, testing and diagnosis should focus on your dog's overall history rather than assuming that the cat is automatically the culprit.

Can Dogs Be Allergic To Other Dogs?

Yes, dogs can potentially be allergic to other dogs, although this also is not common. Just like cats, dogs produce proteins in their skin, saliva, and other bodily substances that could potentially trigger an allergic response.

A dog may come into contact with another dog's saliva during play, for example, or encounter dander on bedding, furniture, or other surfaces. However, if your dog becomes itchy after playing with another dog, an allergy to that particular dog isn't necessarily the most likely explanation. Usually environmental allergies, fleas, food allergies, or contact irritation could cause similar symptoms.

Can Cat Allergens Make Dogs Itchy?

Cat allergens can potentially contribute to itching in a sensitive dog. If allergen-containing dander or saliva comes into contact with your dog's skin, the immune system may react and cause inflammation.

You may notice your dog scratching more, licking their paws, rubbing their face, or chewing at their skin. Some dogs develop recurring ear irritation as well.

However, itching alone doesn't tell you what caused the reaction. Again, fleas, food allergies, seasonal allergies, and other environmental triggers can all cause similar problems.

What Should You Do If Your Dog Is Allergic to Cats?

If your veterinarian has determined that your dog is reacting to cat allergens, completely eliminating exposure may be difficult, particularly when a dog and cat share the same home. Fortunately, reducing allergen levels can sometimes help.

Regularly vacuuming carpets and upholstery can reduce accumulated dander. Washing all the pet bedding frequently and keeping your home clean can also help limit the amount of allergen your dog encounters.

You should also work with your veterinarian to manage your dog's allergy symptoms. Depending on the underlying cause and severity, your veterinarian may recommend treatments designed to control itching and inflammation.

In a multi-pet household, keeping your cat's bedding and favorite resting areas clean can also help reduce the amount of allergen circulating throughout the home which should be done anyway.

Can Dogs and Cats With Allergies Live Together?

Yes.  A dog with an allergy doesn't automatically need to live separately from a cat. The key is determining what actually triggers the dog's symptoms and developing an appropriate management plan.

If your dog and cat have always lived together and your dog suddenly becomes itchy, don't assume that your cat caused the problem. A veterinary examination can help rule out more common causes and determine whether allergy testing or another type of treatment makes sense.

When to See the Vet

If your dog is scratching a lot or keeps licking the same area, he or she might have an allergic reaction. If your dog has any hair loss, inflamed skin, or other symptoms that don't improve, make sure to see your vet. 

Your veterinarian can look for common causes such as fleas, food allergies, environmental allergies, infections, and skin conditions before determining whether another pet could be contributing to the problem.

Final Thoughts

Dogs can be allergic to cats, but it isn't very common. When it happens, the reaction usually involves proteins found in cat dander, saliva, or other substances rather than the cat's fur itself. Because many different allergies can cause the same symptoms, it's important to look at the bigger picture before blaming your cat. With the right diagnosis and allergy management, dogs and cats can often continue sharing the same happy home.