Both my dogs tell on themselves in there own way. My Jack Russell is the same as your labs. He will give you that look with his head down low and the walk of shame.
My German Shepherd, it's the dirty nose that gives it away. She's pretty proud of herself in what ever she does. But usually what ever she's gotten into ends up stuck to her nose. Dirts not a big deal though, just means I have a mower trap to fill with the tractor and box blade. It's when she shows up with stuffing or foam stuck to her nose that I get concerned and need to go investigate quickly
This is little Misty. She is from Prairie Wind Kennel in Cheyenne, WY. She is super well breed and a very sweat natural girl. She is 6 months old and we are very excited about her.
The black puppy on the dog bed with Misty is Cooper. He is out of our kennel and he is 6 months old also. They are best buds.