I bought this clipper for our cocker spaniel and paid about $30 for it at the pet store. The red light goes on at the very tip of the nail and then when you try to clip it, the clippers are so worthless that they just chew up the nail without cutting it. So your dog is already in for a horrible experience. I took the small size clipper back to the store to return it for the larger size. I just got it home and had the exact same experience with the second pair - I could only get it to cut through one nail - it chewed up another one before I quit. DO NOT BUY THIS CLIPPER! It's horrible and a total rip-off. Our poor dog is now traumatized by this thing.