HELP! Puppy aggressive to older dog!
I brought home Cosmo, my 12-week-old GSD, 4 weeks ago. Molly, my 12-year-old American Eskimo, was not thrilled. (We've had her for 6 years, and she was fine with our other dog--who passed in September--but he was here first; they basically ignored each other.) At first Molly snarled and growled at Cosmo when he would approach and he would back away, and then he'd try again, more intensely, with the same result--but escalated--from Molly, until usually we stepped in to stop him from continuing to harass her. Over the last few weeks he has gotten more persistent until once she pinned him on his back and I had to get them apart, but thought, "Maybe he has learned his lesson now!" Unfortunately it has continued to escalate, and the only good news is that it is really only bad when one of them is excited or energetic (for Molly, that's when she thinks it's dinnertime, and for Cosmo that's usually when he wakes up from a nap OR when Molly thinks it's dinnertime and starts running around, getting him hyped up in turn). His behavior has gone from: jumping around her and trying to engage her, to biting at her neck or side as she goes by, to mounting her from the side, to mounting her and biting her neck, to today when he (having now grown a few inches to be her same size) mounted her and pinned her to the floor while biting her neck while she actually screamed--seriously, she sounded human! I pulled him off and separated them. He finally calmed down and note they are napping side by sideg on the floor in front of me. All of these times, from the lesser offenses through today, Molly has protested by snarling, growling, snapping, and chasing after him, but now instead of backing off he comes back harder. Up until recently I really felt like he was trying to play and just not giving up, but today looked much scarier--she was screaming and he wouldn't stop!. He has spent time playing with some other (bigger) dogs at a friend's house, and always takes no for an answer there, but of course they are bigger. I try to get him outside for a good while whenever he gets the "zoomies" but to no avail. And Molly doesn't make things easier by continuing to hang around him once I've separated them. ***Update: as I'm typing this, Cosmo woke up and we went outside for a potty break, can't back inside and were in the kitchen, all calm; Molly wondered in and he immediately mounted her; I pulled him off--she went to lie down and he lay down near her, then he went up to her--she growled and he let her be. I can handle interactions like that, but what of the other stuff, when he won't back down? It doesn't seem like playing. He is a friendly, smart, wonderful puppy otherwise, and Molly is my dear old gal; it's ok with me if he tries to play (as puppy's do) and if she says no but he isn't listening and it's getting worse. Please help!