I've had a yorkie for 3 years. He's very big, active, and loves to run and jump around. I'm starting to think about training him to jump. Where do I start? He can currently jump 3 feet across and 2 feet high.

Yorkies are fairly fragile dogs - the person to ask is your Vet.

Yorkies aren't known for agility, and when small dogs do long and hard jumps it wreaks havoc on their legs backs and other joints. I would HIGHLY suggest you speak with your vet on your decision.