A Spot On My Tongue Hurts What Is The Usual Breed Of Dog Who Has A Blue Spot On The Tongue?

What is the usual breed of dog who has a blue spot on the tongue? - a spot on my tongue hurts

I have my dog is a Labrador bastard (his mother), but you do not know what the race of his father. It is the dominant feature of Labrador, with the exception of the normal hearing. It is a blue spot at the tip of the tongue. I just want to know what the possible race of his father.