I have seen mine take a couple tumbles and I can feel myself holding my breath. It is scary. Mine play a lot less in the house then they did before. If I'm throwing the ball I make sure the ball lands before they go for it, that way they don't slide or come to a sudden stop. To get some energy out either take her for a long walk or do some obedience.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD