Licking mouth of an older dog is a sign of appreciation and obsequious attempts to please a senior in the doggy language. Urinating comes out excitement, very common in puppies. Seems, your older dog doesn't want to accept your puppy, who tries to gain his favours in vain. What definitely will help you - long walks off leash ( having them leashed wouldn't have any effect) on a daily basis, concentrate your attention on your older dog, give him commands, play ball with him and ignore your puppy. Just avoid feeding treats, it may cause misconception. Train them simultaneously to bring you ball in turn a while later. Baron should see in practice you as a leader whom his idol Harley obeys, because he thinks that Harley is a top dog and rules over you.