I’ve had my 9 year old yorkie for about 3 weeks ( took her in after my mom passed away, too much for my dad to handle). I notice her left paw has a nail that’s different color than the others. She never lets us touch that paw when we clean her or wipe her paws down. We took her to the vet 2 weeks ago and they didn’t say anything bad about it when we brought it up. I’ve included a pic just for reference-nail is circled in red.