"We have a Yorki named Abby. Nobody wants to adopt her, because she's special needs," Halgrimson told The Dodo. "She was so badly abused and neglected ... We think she was kept in a small crate for so long that the urine and feces built up in the back, so she couldn't stand up."
When the rescue first took in Abby, she had matted hair that was inches thick, but now she's a fluffy dog who needs an owner willing to deal with diapers and eventually a doggie cart.
If you like the work that Happy Tails is doing, check out their Facebook page and website. There, you'll be able to find more information about donating, fostering and adopting.
Below are a few more photos of Polly's time healing.