Cadaver dogs are not 100% accurate, never have been and most likely never will be.
I totally agree. But when you have 2 dogs that hit on 2 places in the backyard at different times; plus the 2 dogs hitting on the trunk area at different times... that to me makes it highly likely that they're pretty darn accurate. Nothing is 100% though.
Oh, and the car smell too. No, not the pizza smell; or the trash smell; or the cleaner/gasoline smell; or the newest George explaination of Casey running over an animal... the wreaking dead body smell.