I guess all dogs are different because my two are only 12 weeks and they go to bed around 9:30 or 10pm and they don't start to stir in their crate until 6:30 or 7. Which is when I get up anyway. They have never had an accident in the crate. They dont' bark or cry either. My little girl is 2 1/2 lbs and my little boy is 3 1/2 lbs right now. I don't know if size matters?
