My dog does that too. I think it's gross but that is just animal behaviour. When the cat has had enough he rolls on his back and kicks the dog in the face. I let them handle it themselves. Animal manners and human manners are quite different, thank goodness, as I don't like kissing anyone's a**. Ha, ha.
you can't, just don't watch I've heard of stuff you can put in a dogs food to make them stop eating their own poop, so if this stuff is non-toxic to cats I guess you can put it in their food best to be persistent with the vet and wait to hear what he/she says Good Luck