I would repeat almost everything stated above. It is possible that he thought he was protecting you. You should immediately put him in time out. I do think it will get better once they know each other better. Joey will learn Dora is not a threat to him personally, nor to his place/standing in the household. It is very early in the relationship. They should still have scheduled play time together when you can watch them closely and step in if it gets dangerous (but other than that don't get involved, let them work it out). Make the play periods rather short at this point (10 minutes), a couple of times a day. In addition to that take them for leash walks together outside. Being outside together sniffing around will teach them to do things together without any threat to each other.
Ginger does mouth on Taz. At first it scared him. This past week he realized it was play, and he stood up to her. She loved it; it was a real breakthrough. And they are both older and have had three weeks together. You have more issues to work through than we do. I wish you luck. As chocolatepuppy has said there are people on here who have much more knowledge on behavior and training. I will be interested in what they have to suggest.
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