Hi! Everytime Rocky is around another dog he gets very foamy and salivates like mad. He is very friendly and non-aggressive, non-dominant, and seems more interested in the person behind the dog than the actual dog, and is tolerant of their sniffing him, he isn't interested in sniffing them at all, but he does this foaming thing. Is this a form of nervousness or submissive behavior or what?
Rocky is not neutered.