Isabelle Thompson's Twinkie: The Tinest Dog in the World (2009) is a read-along children's photo-book.
It's the true story of a very tiny chihuahua found as an abandoned pup in downtown Los Angeles.
The poor girl was on the edge of death. She needed emergency veterinarian care for pneumonia and a broken leg.
She gets saved, of course, or this wouldn't be a very nice children's book; and she has a lovely life thereafter, not withstanding the exaggeration that she's the tiniest dog in the world.
A humble wee video of Twinkie in person
(in which she frankly seems still a little skittish in life):