Rough Play or Aggression?
We recently brought a 4 month old male Australian Shepherd pup (Tucker) into our home, where we already had a large, dog- and people-friendly Black Lab. Our lab (Gus) is almost 2, and seemed to really enjoy the new pup for the first few days and there was lots of active, happy-looking play -- jumping and darting around and snatching a horse hoof back and forth. He even shares his food and water bowls without complaint. (Though Tucker has his own.)
But I'm concerned the play may be getting more 'bossy', less friendly and perhaps a bit too rough. Gus puts his jaws around Tucker's neck, slaps him with his front paws, and climbs on top of him. Recently, Gus has started 'going for' Tuckers privates and belly. Tucker doesn't seem terribly frightened -- so part of me says it's probably OK, but it would be very easy for Gus to do some pretty serious damage -- at this point, Gus out-weighs Tucker by 50 pounds.
I know they're new together and so I never leave them unsupervised. What do you experts think? Do I have trouble brewing? Or is this the type of initial 'pecking order' behavior that's perfectly appropriate.