Suitable for small dogs, the bite force of large dogs may be too large, the suction cup may not be able to withstand such great strength and fall off Precautions for use: Keep the surface of the suction cup clean; when absorbing the ground, the floor should be flat and the exposed floor should be wiped clean before use. suction cup: if you feel that the suction of the suction cup is not enough, you need to check whether the surface of the suction cup is clean. you can clean it with clear water, wipe it dry, then place it on a smooth ground, press it hard for more than ten seconds, and exhaust the air inside (if the suction is not enough, it may contain a lot of air).