Gizmo's on her third collar in nine months. She claws the others to flinders. I got a cute black one with white mice on it and the mice turned into chenille fringe...and since she was always scratching I figured that her allergies might include polyester products. So I managed to find a very nice little cotton fabric collar (quick release safety) at a cat food store at the same time I got her new steel water and food dishes. If your cat wears a collar and is constantly scratching its head and neck, a change of fabric might help. Gizmo hasn't made as much noise with her 'castanet solos' today.