Nasty.
Its called a Rim Job, a rim job is licking thee butt hole.
Well it depends if she likes it
Yes.
by licking my butt
Because it feels good and probally taste nice
licking butt
Your dog is not going to get sick from licking a cat's butt. Animals are always licking their butts.
No, but you can get a STD or infection.
Butt
This is normal, this is how they clean themselves. If, he is constantly linking there could be a problem, take your dog to the vet.
butt crack.
It's possible that your dog is experiencing anal gland issues, such as impaction or infection, which can cause leaking of fluid from the butt. Sometimes excess licking can aggravate this issue. It's recommended to have your dog examined by a veterinarian for proper diagnosis and treatment.