Found mainly in the horse world this is a usefull tool to strengthen your dogs trotting muscles.
You start out with the bars set as wide apart as your dog is high. Then you increase the distance - We got up to 52 inches with Dara. But it was a tad too long so we set the bars back.
The dog is only to take one stride between the poles and should not hit the poles at all.
Yorkies you will need to buy narrower polls to use. Enjoy
https://www.youtube.com/watch?v=QEur-emCR8E