I adopted my cat as a stray a few months ago and he doesn't like being brushed or having his nails trimmed, but his claws were getting really sharp, so I tried to trim them. I cut one too short but he pulled away as I was doing it so it didn't cut through all the way and part of it is still hanging there. What do I do? I've never had a cat before, so I'm a rookie at all of this.