Thanks for the responses.

That was the first day of week 3 @ frosty. I been doing 15 minutes last week, not all out. I think Ogdogg is right, its not a young dog but it is a dog who's never been off the chain or worked before, before i picked him up. I will send you a video of yesterday's work in private. Maybe you can see what i meant the harness. Lifting the dog up which might have cause an injury? I hope not. The pads are fine.