As many of the reviews I read online about these beds, most customers had tried countless different beds for their big dogs and they always go flat, and we have to continue spending money on a new one every few months. Our lab is plus-size (compared to the average lab) and weighs about 130lb right now (he weighed 150 at one point). We got him the XL size, and it is perfect for him. It is exactly what the video on the website looks like, very firm, very supportive, and our lab got accustomed to it right away. Very happy with this quality so far. I would highly recommend to anyone with a bigger breed who cannot find a bed that is strong enough.