Review on Blueberry Pet Essentials: Wide Variety of Martingale Safety Training Dog Collars in 20+ Colors, Featuring Customization Options by Teresa Wiggins

I like this kind of collar. A fabric loop is attached to the line clip. The loop allows you to widen the opening of the collar to place it on your pet's head. When the pet pulls on the leash, the loop will pull tight through the leash, tightening the collar around your pet's neck so it won't slip off, but it also won't choke them as they are limited by their size and can get. This one has a smaller loop than the one it replaced. After several adjustments, we found the optimal setting. It's still snug to fit on a pet's head and a little looser than I'd like if they pull. It would be better if the loop was 30% larger to increase the collar's range of expansion and contraction, so I only gave it four stars.