I have been thinking about this.... Didn't you say he came from a horder person? I bet he was just shut up somewhere without litter boxes or boxes so dirty that he refused to use them so it is just a habit... I mean when you gotta go, you gotta go SOMEWHERE. It was ok before so what is all the fuss about NOW?

If that is the case, it will take a lot of understanding on your part and I still suggest "time out" for him.

I saw a thing on the Dr. Phil or Opra show about horders. If they have pets, they really love them but just do not take care of them. One lady had, I think a cat and a dog and there was poop and pee everywhere but yet, she said she loved her pets. They just get overwhelmed with the messes and don't know how to fix it so they don't try. (so to him, it is ok to go where ever he wants)

Your baby could associate even one pee biscuite with his past horriable life... Who knows... Just thought I would mention this...