They are thick and sturdy enough even for big dog paws I would think. Waterproof also. A little pricey I think but to save the upholstery and vinyl well worth the money. The clips are very smooth and well made. Everything you need to attach them is included. I'm a little reluctant to use it the other way as I don't want the sticky backs of the Velcro to get onto the upholstery when it gets hot in the car over time.
Great pooch protection for your car's doors...and it really works!!!