I'm sorry this is a tough time. This may seem like too simple of a solution, but have you tried the Canine Lullabies Heartbeat Therapy CDs?GPA in Houston often suggests using them (they sell them too!). I have no personal interest in this company, just so you know. The company offers free copies to rescue organizations. Here's a link http://www.caninelullabies.com
If you use amazon prime, this item is available with free 2 day shipping
BTW, he's a good looking boy!