We have had our new pooch since last Friday (7 month old Treeing Walker Coonhound). There have been a few times that when we have put him in the crate, he barks and whines excessively. We have simply been ignoring him until he stops barking. On nights that he barks a lot it lasts upwards of 30 minutes. Some nights he went right to sleep after a half-hearted single whimper. Suggestions for handling this issue???