I am hoping that someone can explain this behavior to me. Louie likes to lick the cat's behind. It grosses me out b/c then he wants to come and give me kisses!

Also when we go to my aunt's house he walks under the other dogs and licks their genitals. I understand the butt sniffing thing, but Is this a sign of submission or something. Is there some way that I can discourage this behavior?