4 feline house, that was precisely the problem, he did not scratch his ears, at least where I could watch him. Normally a cat will practically bury their paw in an ear with ear mite itch. But to the best of my recollection, I did not see him do this, and therefore, did not suspect any type of infestation. Well, anyway the problem has been taken care of, and I might add his ears appear more pink on the inside since he had this treatment. And his ears are larger than the average cat, probably because of being a blue-eyed, flame-point Siamese.