These stories are so sad.
I had a Chia-Pom, she was about 5lbs. Jumped up and down off the sofa all the time.
She jumped one day and started screaming. She had broken her leg. the bone was showing.
Took her to the vet. he said he could amputate it or do surgery and put pins in it. So, I had the surgery done. She had a cast on her leg.
They ended up cutting off the blood-flow to her foot, it was too tight. One night, while I was asleep, she chewed some of her toes off. When I woke up, I freaked out. took her back in. She ended up with one of those cones on her head.
Her leg did heal, and she was able to walk okay.