Hi there
Thank you for your question.
Before i want to get into answering this question i would like to know a little more about how he behaves. This way i won't give you the right answer to the wrong problem
When you are at home does he follow you a lot? Does he always seem to be by your side? When you arrive home does he get overly excited? Does he whine or pace a lot when he knows you are leaving the house?
Does he ever urinate when you are at home? Is the main area he goes near where the crate was? Does he have access to outside when he needs to go (or somewhere where he is allowed to go)?
The problem may well be a separation anxiety based problem but there may be an underlying cause. He may benefit from a veterinary consult to rule out any medical problems that may be the cause. How old is Rusty?
Hopefully the answers to these questions will help me figure out what is going on and give you the best advice on how to corrrect it
Kind Regards
Todd Field