Dear _________,
What an awesome job you did watching our dogs. You are our favorite pet sitter! Not only did you play with them and take them on numerous walks when we were gone, you made sure they were well fed, happy, and bathed. And from the way they lovingly plop themselves onto your lap to cuddle and show their affection, I can tell that they were pampered and spoiled too! Thank you for everything.
(YOUR NAME HERE)