Pets can suffer a wide variety of allergies. I recently discovered my cat has food allergies. She was vomiting all the time, acting extremely irritable, and getting sick frequently. Our veterinarian was even suggesting we have her put to sleep. It took my son to realize she was acting like someone with food allergies. I guess he's been around me long enough to recognize the symptoms. We changed her from wet cat food to dry and she has a new lease on life. She's back to being the affectionate, happy kitty we love.