If his foster mom was able to get him 90% housetrained, there may be hope. He may just have relapsed because he is in a new home, especially since you have another dog.
You are right. Keeping a belly band on him will just reinforce that he can mark wherever he wants. It's a last resort. Have you spoken to his foster for suggestions? I know many trainers recommend leashing him to you so you can catch him in the act, before he marks. |