Chandler is 5 months old. He is obsessed with the cats. He is always in their room. He poops in the there. I have a gate at the door but he can still fit through the cat door. Today 1 of the cats threw up and he chewed part of the carpet, I tried putting a gate at the bottom of the steps and he keeps knocking it down. I am at a loss on what to do. Any suggestions?