Newton badly needs his rear nails trimmed. He'll hold still enough for me to cut his front but he panics and hides when I put the clippers anywhere near his back feet. I can't use the blanket technique that's been suggested because he thinks it's a game when I cover him with a towel and when I try to get him to stay still, he freaks out and starts acting like he's afraid of me. I'm scared of him being hurt when he's kicking and twisting like that so I've stopped trying. What can I do?