Mob Variation

I think that there should be more variation in pet statistics that can be selectively bred for. Similar to horses being bred for speed, jump, or health, I think other mobs having varied stats would be awesome. For example, wolves being bred for different speed, attack damage, or health stats. Similar could be done with farm animals, changing factors in meat, milk, wool, or leather production. Now if the devs wanna have even more fun, the variation could extend even further into size, shape, pattern, or color (just a thought). But overall I feel like having mobs of varying qualities could add an interesting aspect to multiplayer games, such as breeding and selling high quality cows and sheep, or breeding strong guard wolves. It would also help the game become slightly more realistic. Anyways, I hope people see this, and if you could, please vote for this, thank you!