A friend of mine will probably be moving in with me in the next couple of weeks. She has a poodle who is absolutely the sweetest, most submissive, calmest dog I've ever met. Of course he will be coming with her. Dax is neutered, but her dog is not. I've brought Dax over many times and they play together, but he's never been over here on Dax's territory. My sister has brought her dogs over here before and while Dax gets along fine with them, he has the tendency to pee in the house while they're here. I don't know if this is marking, or if he feels threatened, you wouldn't know it by watching them, they play great together, but I keep thinking maybe he's uncomfortable with it. Dax loves other dogs and loves to play with them, I just don't know how he'll accept another dog living here with us. Any tips on how to make this a smooth transition for Dax, and the other dog of course, to feel as comfortable as possible with the situation? I'm having her come over here this weekend and bring him so we can see how they react together in a new place, I just don't want Dax to be uncomfortable with another dog being here.