I'm another one who does it when the "click clicking" gets too annoying. Or when I notice they're starting to curve downward, whichever comes first.

That's for Jake.

Max . . . . he's a different story. It takes 3 vet techs, multiple scratches and some nearly broken bones, and $20.00 to do his. So - we're lucky he kind of wears them down on his own.