Luckily for me, my mixes, though they looked quite labby, didn't seem to have the destructiveness, though some had a lot of energy.
The funny this is that Mizu, the pure lab, didn't have those traits, either. I think that she was bred as a working lab. She was calm and happy in the house, but very focused on water, swimming, and retrieving.
The other one who had zero of the lab traits was Beyorne. His mother was a show lab who ended up with a male in her walled-off yard. Caleb, the male, was chow and Great Pyrenees. There were a lot of pups! I had recently lost McDuff when I saw the litter on the front page of the local newspaper.
Beyorne looked like a small Newfoundland, and acted like his 25% Pyrenees. He was calm, protective, got along with all animals that we had, and always stayed quietly between the kids and visitors. He never needed to be on a leash - he never went anywhere, just stayed with us. If a cloned dog could be like the original, he would have been a good candidate.
Love All Life, Thank You For Posting! :)