What causes eczema in dogs?

Dog eczema may be caused by allergies, external physical factors, chemical factors, or nutritional deficiency. Allergies are a common cause of eczema in dogs, including food allergies and drug allergies. Next, when a dog is exposed to external physical irritation—such as mechanical pressure or friction—it may also develop eczema. In addition, when a dog lacks vitamins or trace elements, it can trigger eczema and other skin conditions.