I see a lot of weird fronts in Pit Bulls and Am Stafs these days and find them and the subject interesting. One thing that I've noticed practically and in articles written by others is that correct "fronts" are the hardest thing to hang
onto in a breed and, once gone, are about impossible to get back. I've seen this come true!
I thought this was an interesting article about the physics of fronts that apply to all breeds. The following is just part of an article that I posted the link to at the bottom..
Across all species, you want weight-bearing joints placed well under the body to support the bulk of the animal's mass. This is just physics – if the supports are straight and under the area of greatest weight, the weight is given through the supports to the ground. The supports themselves don't have to be spectacularly strong. If, on the other hand, the supports are on the diagonal or are under a different area, the pressure of the building is given to the supports themselves, which means they are much more vulnerable. In a building you can compensate for this by using different materials, but the supports are still an inherently weak spot.
In animals, when you put pressure (the weight of the body) on the legs, the legs should carry the pressure to the ground in a straight line. If they don't, they are forced to endure much more stress even just when the animal is standing still. A lifetime of physical stress equals a middle age or senior life of muscle issues, arthritis, and so on.
What is a “sound” dog? | Ruffly Speaking