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Canada West Veterinary Specialist and 24/7 Emergency at 604.473.4882. Located at 1988 Kootenay Street in Vancouver or if distance is an issue, you may try

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Food Allergies, Intolerance & Your Cat's Sensitive Stomach

One of the more common complaints vets hear from cat parents is that their cat has a sensitive stomach and vomits — maybe once a week, maybe twice a week, but always on the carpet (or somewhere else that's hard to wash). Even though chronic and intermittent vomiting can happen regularly, it is never normal, even if there is plant material or a hairball in the puddle on the floor.


There are two other common reasons your cat may experience a sensitive stomach and vomiting: food intolerance and food allergies.



Food Intolerance


There are many things inside and outside the cat gastrointestinal system that can cause a cat's sensitive stomach, including food intolerance and food allergies. Though they sound similar, these two issues are not the same thing.


Food intolerance can occur in cats of all ages, and it can be caused by food poisoning from spoiled food your cat mistakenly ate or a sensitivity to a certain ingredient. A sensitive stomach from food intolerance can also happen when a cat lacks an enzyme needed to fully digest a certain food, has irritable bowel syndrome or is stressed.


Many things can cause stress in a cat, including boarding, moving, adding a new pet to the family, dental disease or pain from arthritis. If you notice that your cat is vomiting or has diarrhea and you suspect she may have a sensitive stomach, don't change her food just yet. There may be another medical reason for her upsets. If her vomiting or diarrhea is severe or doesn't clear up within 24 hours, it is time to get your veterinarian involved.




Easily Digestible Foods


Some cats with sensitive stomachs may need a change in food. Your cat may not need to avoid eating a certain ingredient, but her type or formula of food could be part of her intolerance problem. One solution for a stressed kitty with digestive symptoms is switch to an easily digestible food.


Digestibility, in pet food research terms, describes how easily a cat or dog can process and get essential nutrients from what they eat. According to the Cameron County Society for the Prevention of Cruelty to Animals, the factors that most influence digestibility are the ingredients, ingredient quality and processing methods used in making a food. Foods for a sensitive stomach, like certain Hill's Prescription Diet® cat foods, include a combination of soluble and insoluble fibers, minerals and healthy fats to make them nutritious yet gentle on your cat's digestive system.



Food Allergies


Unlike an intolerance, a food allergy can affect both the gut and the skin, and is an abnormal immune response to an otherwise safe ingredient. Cat allergies are usually to a protein source such as fish or chicken. Cats most commonly develop food allergies between the ages of 2 and 6, and must be repeatedly exposed to the offending allergen (for example, by eating it every day) to develop signs of a problem. Those signs can include vomiting, diarrhea, flatulence, loss of appetite, itchy skin, hair loss or reddened skin.

Believe it or not, grains such as corn are not the most common cause of food allergies in cats.


If you've ever wrongly suspected your kitty may be reacting to an ingredient, however, you're not alone: Veterinary Practice News writes that most "food allergies" are misdiagnosed by concerned pet parents during a simple stomach upset. According to Tufts University Cummings Veterinary Medical Center, the most common reported allergies for cats and dogs are chicken, beef, dairy, and eggs (and fish for cats).



What to Do About Food Allergies


If you or your vet suspect a food allergy, then it may be time to try a hypoallergenic cat food. Ask your vet to give you their best recommendations; the only way to accurately diagnose a food allergy is with a strict diet trial.


If you are thinking about heading down to the pet store and picking up some new food yourself instead of visiting the vet, wait a minute. This is a common pet parent mistake when dealing with a cat's sensitive stomach. Switching diets around will only confound the issue and make it harder for your vet to figure out the right way to treat your kitty's dietary woes.

Most over-the-counter diets are also not considered hypoallergenic. Even if a food is labeled "fish," there can still be trace amounts of chicken, beef or eggs present because many types of pet foods are made in the same facilities with the same equipment. Just like a plain chocolate bar often warns "may contain traces of peanuts," cross-contamination can affect pet food manufacturing similarly.


Proper food trials will take about 10–12 weeks in which your cat must eat her new food and nothing else — no treats, no scrambled eggs and no kitty toothpaste, unless it is cleared by your vet. If your cat has a true food allergy, then any sensitive stomach issues should clear up in 2 to 4 weeks. External symptoms like itchy skin will take longer to resolve. A minimum 12-week meal trial is recommended for skin issues because it takes that long for a cat to grow a new outer layer of skin cells (human skin takes about 39 days to turn over, according to Business Insider). If you have been religious about your diet trial but your cat is still having problems, then the issue isn't a food allergy and it's time to check for other conditions.



What Are Hypoallergenic Diets?

Hypoallergenic therapeutic diets are specially formulated and produced to be free of contaminating allergens that might set your cat's sensitive stomach on edge. Do yourself a favor and get the cat food that your vet recommends right from the start, and follow all diet trial instructions carefully. If your cat sneaks anything else to eat, then you have to start the trial over again. Yes, you may spend more on this food versus a grocery store brand, but remember: you are investing in your pet's health, and in this case, food really is medicine.



A truly hypoallergenic cat food uses hydrolyzed proteins, meaning that they have been broken down so far that your cat's body doesn't recognize the allergen allowing your cat to process the food as intended. Another solution is to use a food with a novel protein like duck or venison, as these are protein sources that your cat might not normally be exposed to in other foods. If giving your cat treats is an important part of her training, there are also hypoallergenic treats, but always check with your vet first. No matter the cause of your cat's tummy woes, your vet can help you find a way to soothe them.


Author: Dr. Sarah Wooten