Hi! We had to leave our adorable Golden Retriever, Hendrix, while at WDW last year (September of 07). It was hard!
We adore our vet and chose to leave him there (they have a small kennel for patients that need it, not those that are sick, it is in the same building as the vet, just completely seperate).
I knew he was in good hands, but it was still hard! Except for Labor Day week-end, he was the only dog there and boy did they spoil him! Everytime I called to check on him (and believe me I did LOL) one of the two main young ladies there would tell me something he did (some cute story or trick)!

We got him a new Kong treat ball, a can of Kong peanut butter flavored "goop" to use in it, and a box of Scooby Snacks to have while there (the SS were to share with friends he met/boarded with).
We were gone a total of 14 days! We were thrilled to see him and he was thrilled to see us! He did "kiss" one of the girls (staff) there goodbye though, when she brought his belongings to us!
He will stay there again for our 2008 trip. I hate to leave him BUT it is easier when you
absolutely know they are in good hands!