I use the...
Grreat Choice™ Basic Adjustable Dog Harness - Harnesses - Collars, Harnesses & Leashes - PetSmart
for both of mine.
However my reasoning is, I take them hunting and the brush can get pretty rugged around the Bayous. (I use retractable Leash's too) If I did just casual walks, I might choose another style, but...
This harness is really tough, reliable and easy to put on.