I rescued a Doxie in May. He was from a kill shelter in WVA. They think he's around 2 or 3 and was not neutered till May. He has never pooped, peed, or thrown up in my house. We go for a two mile walk every day along with my other dog, a Boston mix where he poops and lifts his leg every other tree. . Today I took both dogs to daughters house for Thanksgiving. Half way thru the day, Wally pooped in their kitchen.. a great big pile, and then a few hours later did the same thing in their living room. Two very big piles. Needless to say he won't be invited back. He knows these people but there were more than he was used to and there is a dominant bossy cat who hates dogs(but he lives with 5 cats) and grandson was rough housing him which we don't do. What would make him do this? Anxiety? And how does a 21 pound dog have such large piles of excrement?