 Better Business Bureau
Take some good close-up pics of the dog's feet right away (both feet and the whole dog), to prove that the pics are of the dog they groomed. Then contact the Los Angeles Better Business Bureau to file a complaint.
Sounds convincing that they nicked your dog's feet. It would be unlikely that both back feet would be injured by accident some other way (one maybe, but not both). When a dog comes back from the groomers with both back feet nicked, there's not another good explanation.
I agree about learning to groom your dog yourself. I started doing that many years ago because my poodle would come out trembling after being groomed. |