May 14, 2019 · Direct contact with an allergy-causing pet may trigger allergic dermatitis, causing signs and symptoms, such as: Raised, red patches of skin (hives). Eczema. Itchy skin. Dog skin allergies can be caused by many factors including plants, food, dander, insects, medication, and anything in between. These allergies cause a multitude of symptoms that could be anything from Scratching and chewing, to rashes and inflammation just to name some of the more common ones.
May 07, 2019 · Over time, dogs can develop hair loss, thickened skin, hyperpigmentation, hot spots, and ear irritation, so keep an eye out for those symptoms. Allergic contact dermatitis is an overreaction to something that touches your skin. The result is a red, itchy rash at that spot. Learn more from WebMD.