Skin Infections & Allergies. Bacterial skin infections are the third major cause of itching in dogs. Most of these infections occur when the immune system is compromised by allergies, illness or stress.
Does your adult dog suffer from itchy skin that is characterized by red sores or patches? The cause may be canine Erythema Multiforme or (EM). Canine Erythema Multiform has been associated with a variety of factors and may affect dogs, cats, and even humans!