[gunnr]

I've been using this one from Cabela's.

Cabela's Reflective Dog Harness | Cabela's

An easy-to-see, everyday harness design that gives you control over your dog without causing discomfort, the Cabela's Reflective Dog Harness makes a great choice for outdoor adventures. This...

www.cabelas.com

Finn has no issue with it and his gait is just fine, at any speed. He also swims in it. He wears everytime he is in the field because it gives the chest area a little bit more protection from abrasion.
It's very fast fast and easy to put on, once you size it to the dog. It also has another D ring on the chest area.