An interesting new book - The Healthy Way to Stretch Your Dog - A Physical Therapy Approach was just released in early March 2009.
Research on human athletes is changing what we know about stretching. For example, it is now recognized that aggressive stretching should only take place after muscles are warmed up and shortened from exertion. Authors Sasha and Ashley Foster have applied this latest research to dogs-many of whom compete in vigorous canine sporting events-so that you can learn how to safely and effectively stretch your dog to prevent injuries, maintain joint integrity, and improve you dog's fitness whether he is an elite canine athlete or a lap dog.
I just added the book to my Canine Athletes Squidoo lens - which you may want to check out for all kinds of resources to keep us dog sporting maniacs healthy, happy, and running our best. And, oh, there are some resources for the handler Mum and Dad's too!