Fatman and GiGi are my scratcher fanatics so I dont mess with their nails. Even though they are sharp they are still quite short. Hercules has 2 nails on each paw that if left alone will grow into his pad. He actually has bumps on the pads of his feet from them being unattended for so long. I check his nails once a week and use a human nail clipper and just go to town he loves it because its mine and his alone time and he gets tons of snuggles and scritches afterwards.