Lindsey Vonn adopts a homeless dog with a bum knee

A day after Lindsey Vonn announced that her injured knee would keep her out of the Olympics next month, the skier went out and adopted a homeless dog ... which has a bad knee.

Vonn, who you probably know is dating Tiger Woods, picked up her new dog, Leo, at a local animal shelter in Jupiter, Fla.

She said the dog is recovering from being hit by a car.

By the looks of it, Leo appears to be a great dog:

Here's another shot of her and Leo.