There are a number of reasons that dogs will be itchy and scratch themselves. Parasites, like lice, mites, and fleas can cause a great deal of discomfort for a dog, but today I would like to focus on allergies. Allergies are easily the top cause of itchiness in dogs that I see in my practice. Dogs can have allergies to things in their environment, like grasses, weeds, and trees. They can also be allergic to things in their food. I’d like to talk about both of these in a little greater detail in this post.