About the housebreaking, it is never too late to train them. Keep showing her the doggy door every day and soon she should catch on.

You're really going to have to use your judgement about her getting along with PJ. Its possible she will settle down and learn not to play like that with him. After adopting a dog from a shelter, there is a "honeymoon" period of about 2 weeks. Sometimes dogs come home as perfect angels, then 2 weeks later they start getting into all sorts of trouble. Some are the exact opposite. Whenever someone calls the shelter here complaining that the dog they just adopted is having behavioral problems, we ask that they give it two weeks.

Also, when someone adopts a new dog and they already have another dog at home, we recommend the following: The dog should spend 50% of the day bonding with the humans in the house, 25% supervised with the other dog, and 25% alone. I realize this is hard for some people to arrange but it really works if you can work it out. I did this with Reece and Harley and the transition was very smooth. There are a few other suggestions about bringing a second dog home but those have to be done right away so I won't list them.

I would give it more time. I'm sure she'll pick up on the house training. What worries me is how she doesn't back off when PJ warns her to. You can call your shelter and see if they can give you any suggestions. They are usually very helpful and want to help you live comfortably with your dog.

If it doesn't work and you have to rehome her, let me know. I may be able to find a home for her so she won't have to go back to the shelter. I live about 3 hours from you.

Good luck!