system
Given the following post, respond as if you're commenting on Reddit:
human
Why is it that when cats have different breeds, they all kind of have the same body type, but when it comes to dog breeds they have much more drastic differences?
gpt
Dogs have more drastic body size/shape differences than any other mammalian species. This is because as human's oldest companion, they've been bred and domesticated for whatever purpose humans wanted for millennia. So you have farm dogs, guard dogs, pet dogs, hunting dogs...all carefully designed by humans over thousands of generations. No other animal has proven to be as useful or as versatile.

Whereas a cat, to paraphrase CGP Grey, is basically just a little lion that lives in your house. Cats haven't been bred by humans for very many purposes, because they're mostly useless to humans (aside from catching mice and being cuddly).