I can definately relate to you on this one, I think I was more worried than anyone when I had to leave my 3 month old puppy at the kennel.

Here's what I did:
1. Brought a T-shirt with my smell on it
2. plenty of treats that are his favorite so it reminds him of home
3. Buy a neat new toy that he hasn't seen before - this will keep them busy!

Other than that, just call in once in a while (or everyday like I did!) and find out how its going.

I found out in my situation that another puppy was in the kennel and they played 4-5 hours a day and wore each other out! It was like I wasn't even missed!

Good luck, you will make the best decision for you and your "child".

Michelle