My mom grew up on a farm so as a kid, we had pets. At on time we had 3 dogs, 3 cats and their litters, frogs in the bathtub, canaries, turtles and a lizard. And all of this in a track home in the Valley (San Fernando).
When it was my turn to have a pet, in my own place, I had a Labrador who, at the time, was mixed with a Rhodesian Ridgeback. At the time I didn't know it was a mix since they resemble one another, save for the size. RRs are bred to hunt lions, so that should give you an idea of just how strongly built they are. At six months he bumped my TT setup and knocked it over. His canines were huge. I was told he would get to well over 100 lbs. (from his Labrador side).
He was easily trained and incredibly loyal and well behaved. It was too good a thing as one one day when I went to the side gate to get him for a walk, he was gone. It seems someone had stole him. If you are ever in need for an obedient, well behaved and loyal dog, consider a Rhodesian Ridgeback.
All the best,