I have brought home a six-year-old GSD this week who is retired from breeding. She knows all her commands and has been incredibly well-behaved since we brought her home. The one thing she's not familiar with is hardwood floors. She's done fine with the floors, but she is struggling on our hardwood stairs. She wants to run up and down them as fast as she can, which just makes it harder to maneuver on the wood floors. Any advice for how to get her to take the stairs slowly?