I will use the harness seldom (for walking) or for visiting a vet. My dog is off-leash most of time as it is a guard dog at the yard (he does not wear anything being there). The most important in training, I suppose, is walking on a leash. It is going well now too. But being a puppy he used to wear a harness. The harnesses we have on the market locally in fact do not suit any more. So I've found your company for extra large dogs. A huge thank you from the depth of my heart for the cool service.