Well, we've never had to crate train a puppy, but I think we're going to have to with this one. He's not quite getting the pooping outside part, so I need to crate him at night. First of all, how big should the crate be? We have a few pet taxis - he's 11 pounds, and 3 months old. And any other tips? I assume I will have a couple of nights waking up in the middle of the night, but that's ok. Thanks! Kim.