Usually it's best to introduce two dogs on neutral territory, so that neither one feels they need to defend prior ownership.
In this case, since Oliver is much older, not well, and it's his permanent home, I think providing him the run of the house (almost), and containing the puppy in a small area is probably best. One suggestion is to get them near (on either side of the gate, for instance), and treating each as long as there's no barking or other signs of aggression. Do that for 5 minutes, then give them a break. Then do it again. Pretty soon they will associate seeing the other dog with treats. That's good! Then try some brief time with supervised interaction.
I agree that the new puppy probably snapped out of fear. I wouldn't be surprised if she started rolling over and showing submission once she becomes used to his presence. Again, provide treats for both dogs (best if there are 2 humans to do this simultaneously) while they're near each other. Thus, it's a good thing.
Don't worry and don't rush things. It takes time, and the dogs will pick up on your emotions, so if you're stressed, they will be. If you're calm, that spreads to them, too. |