My 5 year old unneutered male Golden Retriever is displaying a relatively new behavior. He is excessively licking our friend's neutered male dog's private parts as well as the rest of his body. He also is constantly humping the dog and licks the ground where the dog just peed. We have to physically hold him down to keep him away from the other dog. Our Golden is just way too excited to try to calm down no matter what we have tried. Is this to do with the fact he is not neutered? Is it about dominance? Will neutering him stop the problem?