I have two shih tzu's at home elvis and romeo. Up until recently both dogs have had no potty training issues. When I first got romeo I trained him to go to the bathroom hooked on a chain by the door. When I got elvis he was used to going freely in the yard. Well I began to let both dogs just run out into the grass and go, but now that winter is coming I wanted elvis to learn to go on the chain by the door. The past few weeks I have been chaining him up and he usually will pee outside but he holds his poop until I let him in and then he goes in the house, sometimes he will even go right in front of me. Is he doing this because he is mad about the leash?. I just don't know what to do with him anymore! ANY advice would be apperciated... Thanks