Dermatitis comes in many different forms, and pets are affected by it in dozens of different ways. Dermatitis can cause inflammation of the skin, hair loss, skin sores, itching, rashes, dandruff, and overall discomfort. Dermatitis is one of those diseases that can be particularly frustrating to pet owners because there are so many different causes that can contribute to these conditions. The condition can be particularly stressful to both the owner and the pet when the symptoms become severe and the pet is clearly suffering.