Hi there, my black lab pup has a grey beard and has done since I have had him. I’ve been reading that this is linked to aging, so should I be worried? I would assume this shouldn’t be present in a pup? He is 10 weeks now. The first pic I saw him in was when he was 4 weeks and it was there then too. I thought it was an endearing characteristic but now I am worried that it means there is something wrong? Any advice would be appreciated.