Hi! So,I'd say a few months ago I noticed one of Comet's back foot nail things was brown( it was the nail that you aren't supposed to cut because they use it for grooming or something) I figured maybe maybe it was just dirty, maybe he just went to the bathroom in his pouch or something. I don't know. Fast forward to now, and his back little nails are still brown and I'm not really sure why or if it's a sign that something is wrong? He's acting normal and all that, I just don't know why his nail is brown or if that's bad.