Warped plastic
Total waste of money amd plastic. My dog went to sniff, put one paw on it and there was a loud ' POP', now she won't go near it. I realised that the plastic is slightly warped' causing a slight bump rising in the centre, put pressure on it and it the bump to invert, which pushes the rubber 'feet' off the floor and causing it to spin on the floor. DO NOT BUY. Pads are better off on the floor.