I need suggestions on keeping my 8 month old puppy happy when the wife and I want to shut the door to the bedroom. He usually sleeps in bed with us, and otherwise is very well behaved. While we work he stays in a crate. If we crate him while in the house he won't stop crying. He will roam the house while we run short errands (1-2 hours) with no trouble (chewing, accidents) but if we leave him out he'll scratch at the door and cry. I've tried giving him busy bones, but I worry that they are too much food for him. He's only 20 pounds and he'll eat a whole one if I let him. I just worry that's an excessive amount of food for a puppy with his usual dinner. Harder chew treats like pig ears don't hold his attention long enough though. Any suggestions?