From the manufacturer:
1. The first thing you want to do is make sure there will be no hair in the way. If your dog has long hair, you need to band it back so there's no chance it can get caught in the grinder's spinning tip. If your dog has long hair on his paws and between his foot pads, it's best to trim it first to lessen the risk of catching it in the grinder. Using a small nylon stocking or sock over the pet’s paw and push the nails through a hole at the end to ensure only the nails are exposed is a good using tips for your reference.
2. For your pet's safety, it should not be more than 5 seconds for one lasting time, and be aware to adjust the grooming angle to polish pet nails.
very dog has different sensitivity, especially for some small or anxious dog, please be more patient. More using suggestions please read the user manual and tips, which are in the product package.