Allergies are rare and true allergies are more commonly due to environmental factors than food. Food intolerances are a different matter though. You can usually get an idea if it is an environmental problem versus a food problem by where the dog is itching. Environmental allergies are usually contact allergies and the dog will experience itchy skin in the specific areas where the contact occurs, like feet with a grass allergy, or stomach for something the dog lies down on. Fleas hang out around the neck and tail. Food allergies/ intolerances tend to be a more generalized reaction, itching all over, soft stools, vomitting, eye discharge, ear irritation.
