
A Papillon pup I bred in my last litter had a nose not filled in long after the others had, so I let him go as a pet. My mentor said she'd never seen one have a nose fill in past 12 weeks. Well I visited him yesterday, he is 5 ½ months old now, and NOW his nose has filled in. "Luckily" I almost have to say he did turn out with another couple of faults that wouldn't have made him suitable for showing anyway, as otherwise it could have been a bit annoying LOL. (But of course the main thing is, he's in a great home.)
On the other hand my first Cavalier was sold to me as a pet for the very same reason at 14 weeks, and his nose never filled in.