I always assumed it was something akin to humans cracking our knuckles. Just a pleasurable stretching sensation for their claws or something. I have zero eviden

I always assumed it was something akin to humans cracking our knuckles. Just a pleasurable stretching sensation for their claws or something. I have zero evidence to back this up, but it seems to me like if I had retractable claws I'd want to "stretch" them regularly.