:Rubs hands together:
Hiiii! I haven't in a while but my dog used to pull her wagon quite happily.
What sort of harness are you looking into? I just used an x-back style..
Getting started I'd just put the harness on her for a bit, I used positive reinforcement. Loads of positive reinforcement. Once she was used too wearing the harness around I hooked her up to a fence (you want something sturdy) and walked a few feet away and frantically called to her. When she'd put weight against the harness she got loads of praise and treats.
I let her put weight against the harness several times a day until she had a 'pull' command. Then we moved on to rigging her up to the empty wagon. We also had it tied out far behind her because the sound of the wheels made her nervous.
After a while of pulling the wagon with ease and no misteps we began to add weight in 5lb increments. We got her up to 20 pounds before I moved. Since moving we really haven't worked with her harness and wagon. :< She loved it.
Theres a girl in the Pets and Animals Guild named GabbyAnimalLover I think.. Her dog is named Cowboy and she really helped me out and gave me loads of advice in the begining.
biggrin