My 4 month old lab mix puppy and my 9 year old lab mix dog are just starting to tolerate each other. If they each have a bone they will sit together and eat them. Otherwise the puppy wants to bite and lick the older dog and she will growl at the puppy to stop. Lately the when the older dog is just laying around the puppy will climb onto her head and sit on top of the older dogs head. It is the strangest thing. And the older dog lets her! We find it so funny but wonder why the puppy would be doing this and why the older dog tolerates it! She literally strattles her head with a leg on each side like she is riding on top of her! Does anyone know why the puppy is doing this?