Over the years, the gengineers have uplifted most of the dog breeds.  The process works best on the larger breeds.  I guess there’s questions of brain size versus skull size and such.  But they’ve refined the uplifting process pretty good until even the toy breeds can get the full treatments.  And I’ve learned to never underestimate the vocabulary of a pissed off Chihuahua.  Which, come to think of it, is most Chihuahuas I’ve met.