I’ve heard several people admire these posters around the city and wonder who's behind them.

A google search for HEEL Chihuahua turns up a sponsored link for
heel.la with a “we will not be fashion accessories” manifesto on YouTube that's racked up 466,725 views.
I also found
this post which explains it’s all a teaser campaign for an upcoming Disney movie called
Beverly Hills Chihuahua.
The campaign borrows heavily from
Obey The Purebreed...

...which borrows heavily from
Shepard Fairey, who borrows heavily from
all over. In any case, it’s better than the actual movie poster:

Nice to see that
movie marketing keeps
experimenting.