Sure, there is a rat-chi (rat terrier + chihuahua):
And there is a chiweenie (chihuahua + dachshund):
And a chug (chihuahua + pug):
And a german shepherd + kelpie pack leader:
But there are absolutely no purebred chihuahuas here.
They came from Muttville, a senior dog rescue based in San Francisco, in early April. We are adjusting to having four dogs pretty well, although walking all of them together is quite the circus. They like it, though—they identify as a pack and they like to be all together. It's pretty amusing to watch us come down the street, and we've almost certainly cemented our neighborhood rep as crazy ladies.
Coffee and Ethel are both in obedience classes right now, so it's pretty much all dog interaction, all the time.