I've tried almost every harness out there at this point and some are better than others. The Perfect Fit harness is not that great and I cannot recommend it. The straps loosen too much just from one 20 minute walk, they just don't stay in place. The angle of the straps around the neck and shoulders is just awkward and buckles on the top area where. The angle of rear straps and where they clip onto to top of the harness just doensn't seem like a good design. It's needs an extension around the body in order for that angle of the attachment points to work and for the harness to stay in place around the body. The D-ring on the top is in the worst place--towards the front part so when you walk alongside your dog the leash pulls on the harness and it rotates to the side so it never stays in place. I gave this a one star because this is actually the worst harness of this type that I've tried. For reference, my dog is 64lbs and 3 yrs old. There are better and lower costing harnesses on the market.