Michelle and I just got a 15 week old AKC Great Dane puppy and Baxter (red and white) is not having it. Baxter is very possessive and tries to guard me from the new puppy. He shows his teeth, growls, and snaps at the puppy whenever the puppy is near. We let both Corgi's meet the puppy one on one, Frank loves him, Baxter goes into fight or flight mode when the puppy sniffs him. We've taken our Corgi's to the dog park since we were able to and Frank and Baxter have no problem with strange, larger dogs. I'm sure people have experienced this before with introducing other breeds to the Corgi pack, what did you do to make it work?