Frankie's been licking and licking and licking his back foot. I checked it and it appears he's torn is "pinky" toenail. It looks like it's cracked right in the middle, but it's not hanging off and it's not bleeding. We've been putting musher's secret on it all weekend which seems to help (with the not licking anyway). Do you think he needs to go to the vet, or perhaps it will just fall off on it's own?