Most Labradors have completely pink tongues, but sometimes you will get a Lab with black spots on their tongue. Although this is common in some dog breeds, in Labs it's less frequently found. However it's not as rare as you might think. In this article you can find out what the black spots on your dog's tongue means: Black Spot On Dog's Tongue - Facts About Tongue Spots In Labs And Other Dogs
One of my Labs has a very large black patch on his tongue and a gundog trainer said to me in a class, "all dogs with black on their tongues run in" (Drift was a pain doing that at that point) and I was so gullible I believed him for a few minutes
Let's hear for spotty-tongued pups! Brogan didn't get his until he was over a year old. One day I noticed this big sploch on his tongue and thought, "Oh my goodness, he's EATEN a pen!" The vet thought it was HILARIOUS that I brought my dog in for an emergency appointment for a spotty tongue.
Quinn's black spots get comments all the time! When we picked her up, we noticed them as tiny specks and they grew bigger as she did!