The medium station built dog is over all the best. When they get to tall and racy built. The bones tend to be smaller, the front of chest gets to upside down U shaped. Which that type of chest lacks deep muscle mass and less of a deep breathing length of chest. Tend to get more barrel chested.

Of course some dogs do not know how they are built and still perform well. Breeding real stocky built, heavy muscled types to each other usually produce to much of the same thing. One breeder I know Harris, said he liked a lean athletic male bred over a more muscular bitch. To try and get a more balanced dog build wise.

Sometimes you just have to play the cards you are dealt with. The dogs need deep gaminess first, but still will perform their best with a race car built body. I liked big teeth with a thick bottom base to the teeth. That was a big bonus also.

That Weird Jack dog's build is a good example of a lot of dog for the weight and built to wrestle and push another dog hard. Head is not to big and well balanced for the neck and body to carry. Cheers