My parents' gorgeous three-year-old pit bull, Mara, aka Mars Bar, is putting up a good fight against mast cell cancer. Known at the vet's as "Miss Happiness," they can stick her with needles, isolate her in a crate and do surgery on her and she's still the happiest and friendliest dog anyone's ever seen. Every single dog and cat is her new play pal. Each human is her new best friend. She's gone through two surgeries and when it's all over we're going to celebrate with some Mara-garitas!