THAT'S A HORRIBLE QUESTION! We need to stop it! I mean how would you like it if you were a dog and I smashed your face with my foot cause I felt like it? Animals are abused everyday. And its not fair to them. They can't do nothing! So you better not hurt an animal!!
I have the same problem, but I found out my other dogs lick her a lot. Maybe if you have other dogs, they just lick her.