updated 12/07/2011 AT 5:40 PM ET
•originally published 12/07/2011 AT 9:00 AM ET
She’s always been his best friend, but now, Michael Vartan is waxing romantic about his chocolate Lab, Millie.
“You are the most gentle and tender creature I know, your sweet little essence ever soothing to my soul,” he writes in a letter to his beloved pet, as part of a new book, A Letter to My Dog.
“I intended to write a letter thanking you for your unconditional love and unwavering loyalty,” Vartan continues. “But instead, and I’ve given this a lot of thought, I’m writing to thank you for letting ME love YOU!”