I aready have two of these harness's for my other two dogs and purchased this one for my new puppy who is rather large, although this is a harness for use in your car, I also perfer this harness for walking my dogs. I have found that harness's I have purchased meant for walking the dog are oft times not up to the job! In my experience as soon as the dog pulls backwards on the lead other designs of harness's are apt to come right off over the dogs head not a good thing in a built up area, providing this driving harness is properly fitted and is the correct size for your dog this does not happen.