This is where GENETICS (not guhnetikz, they're completely different) actually does make sense. Bullmastiffs were originally created and inbred and bred BY HUMANS to make them this way as guard dogs for large estates. They are not agile, they do not run and jump on their own, because they are bred to just sit at a gate/door wtf and look intimidating and then maybe attack if necessary, but honestly they were really bred just to be living lawn ornaments, essentially, to intimidate possible intruders. Which is absolutely fucking nothing like fat people.