full bred or not

Question
I just recently bought a grapevine pittbull puppy
He is solid white but his nose is black and white
Someone told me he was a mix breed because his nose isn't a solid color
Is this true?

Answer
Athough I have no idea what a "grapevine" pit bull puppy refers to, I do know that because you puppy's nose isn't solid black is no indication of whether it is purebred or not. If your puppy is still under 6 months of age, the black may still fill in. I don't know where people come up with ideas like this.