What can boxer dogs be allergic to?

Dogs can suffer from Allergies as well as cause them. In fact, allergies are all too common among canines. They can't be cured, but they can be treated, both with medication and by protecting your dog, as much as possible, from whatever's making him sick.

As in humans, allergies are caused by an immune system that overreacts to an everyday substance, such as fleas, pollen, or a certain food. Here's more info: http://dogtime.com/allergies-dog.html