Our fix terrier would fight her harness and escape. With her new harness she practically puts it on herself. It is simple to put on and off so her impatient self doesn't mind.
She is not hampered when she goes running. We are very happy with it.
Singletrak Pack - Sleek Fitting Dog Backpack with Hydration Bladders
The ONLY reason I had to buy another one is because I was stupid and left it out with treats still in it with a puppy around. If it hadn't been chewed to pieces, my first one would still have been absolutely perfect after 2 years of daily use. Instant re-buy
Great harness for a Houdini whippet. Now no longer able to escape!
Flagline Dog Harness with Handle - lightweight, adventure dog harness