I will not use a collar on my dog. It isn't good for her neck and I don't like something wrapped around her neck all day. She's alway worn a harness since ever since I adopted her. This is a trustworthy harness!
This is a really great product for those who hate regular around the neck leashes like I do. They're usually a tad pricey, but it's much better for your pet then regular collars. You should try it for sure!
I have a little black one like this and it works great for my tiny chihuahua. we took her on a road tril in a motor home and she didn't mind wearing this harness and it really helped to walk her and not make her feel hurt in anyway.