If you start your pup out when it's small. Just run in the yard. I run Moki. But not to much and not everyday. He's just a pup. No jumping and don't over do it. I'm getting him in shape so i can do agility. But they don't recommend agility till the are a year. I let him run and stop when he wants. He will fetch and recall for 10 mins straight no problem and he will run as fast as he can. If I don't run him for a couple days he gets bad and goes crazy= all the built up energy. So if you condition your pup you have to stay will it of they will be conditioned to tear stuff up
. But i would recommend getting his knees checked first. Yorkies can have bad knees. Vet said Moki was 0 so thats good. No wiggle. But I dunno if they can really tell or not? I took him to 2 different Vets both said the same.Let the pups reactions to your playing tell you JMO