My dog has not had an accident at my house or any other house in about a year, but everytime I take her to visit my brother and his family she poops in his house - usually upstairs in his bedroom. He has another dog, and while I won't say they are friends, they had an armed tolerance of each other. And Cricket seems to love being with my nieces and sister-in-law. Friday night I took her and had just told her we'd go outside. I was putting on my coat when she walked over to me and right in front of me pooped. Something she has never done before. Again, this seems to be an issue only at his house. She doesn't have these accidents when I take her to my parents' house. Is this a marking thing? (which I thought was only pee) A scared thing, a dominance thing - what?