Both of my dogs are rescues. My english shepherd was adopted from a shelter where she had been surrendered. My border collie was from a rescue because he had originally been in a pet store and an inadequete family bought him. My border collie has lots of ball drive, and frisbee drive. I do agility with both of my dogs, and I as sson as I find a team close by my BC will be in flyball training. Rescuing my dogs has been such a rewarding experience. They are so devoted to me because they were given a second chace when others gave up on them.
Check out this webpage http://bcrescue.org/phpbb2/viewforum.php?f=22
Most of those dogs are rescues