Chloe used to have a big, black beautiful nose. It has just in the last 5 months changed to a lighter shade of brown. I spoke to my vet about it on her check-up and she said that because Chloe likes to dig (she stuffs her ball under logs in the summer or under snow in the winter) it has 'damaged' the pigments and caused it to change. She said her dog's nose is now pink because of this. Has anyone else had this issue? What did your vet say about this? Should I be concerned?