When my dog, Hunter, was younger he had a bad hip joint. A hip joint is when the hip disconnects from the leg.
It happened like this! My dog Hunter, was running around the neighborhood. She saw a man and got excited and ran by him. The man tried to grab Hunter, but Hunter got scared and snapped at the man. He yelled at Hunter so Hunter backed up. At that same moment another man came driving up the road and the car hit Hunter's leg.
My mom ran over to Hunter thinking he would be more hurt. My mom put Hunter in the car and took him to the vet. The man that accidently hit Hunter's leg came to our house the next day and appologized to us. Luckily for us Hunter didn't need a cast and he was back to himself within a two weeks.