Many cats suffer from allergies of various types. While it isn’t obvious in some cats with mild allergies, those with severe allergies can be quite uncomfortable and live a less healthy life because of them. Some signs of allergy in your cat include sneezing, coughing, scratching, runny eyes, vomiting, diarrhea, itchy back or ears, snoring and chewing of the paws. Cat allergies can be caused by tree, grass and weed pollen, fleas and flea bites, prescription drugs, cigarette smoke and even diet. A number of manufacturers have developed supplements to help alleviate allergy symptoms and even help cats avoid those allergies. Such supplements often contain probiotics, quercetin, omega fatty acids, L-theanine, fish oil and magnesium among other ingredients. Many help not only cats’ allergies, but can assist them in growing a thicker, healthier coat.