I just got a chocolate lab puppy about four weeks ago, I have a 7 year old black lab as well. My older lab has had bad experiences with other smaller dogs so I don't know if it will get better when she get bigger. Lately the puppy is jumping up on the older one, and teeth are bared and growling. She doesn't hurt her since there isn't any yelping, I just need to know if it's playing or aggressive so I can stop it early. If it is aggressive how do I stop it? Thanks for helping!