Food allergies make up only 10 percent of allergies among dogs and cats -- symptoms include pets scratching and itching their ears, head, neck and forelegs -- but they can be the most frustrating and expensive allergies to manage. If your pet suffers from food allergies, your best bet is a hypoallergenic diet. But getting your pet on the right one takes some time and testing. Fortunately, there are a slew of commercial hypoallergenic brands available, including some that are cheaper (and better, say some experts and consumers) than the prescription brands.read more