I went to PetSmart and bought a shock collar for Riley. Since the Muzzles don’t work, maybe we can use the shock collar to stop him from fighting with Bones. I got one that has varying levels and a tone before the shock. We brought it home and tried it out on our arms. At level 1 you don’t feel anything. At level 2, you feel a tingling. At level 3 you go ouch. At level 4 you have a reflex and jerk away from the unit.