What could cause my Chihuahua scratch his ears?
There was a young lady from Natchez Whose garments were covered in patches. When comment arose On the state of her clothes, She replied, "When ah itches, ah scratches." Sounds to me as though your dog has itchy ears. Or fleas. You could try treating him with Frontline.
itchy ears? or some sort of parasite.... or perhaps last time you bathed it you got soap in them...
Possible Ear Infection, Fleas, Insect (Ant) on him/her
Fleas maybe ? Take him to the doctor