its tongue it means it is full bred?

i dont think so...

ive never heard that before..i think its just a birth mark

Not true at all.

No. Where did you get this erroneous information.?

im not sure but i was told that meant it was mixed with or was a chow chow

black dots usually mean that the dog is a mixed

There may be breeds that include a black spot on the tongue as part of the breed standard, and thus a dog without this mark would not be conforming. But you can't assume the reverse is true, as clearly some breeds do NOT have black spots. And even if you see a black spot on a breed that requires one, it could just be luck, and the dog may still be a mix.

My mother is a dog breeder and seeing as many full bred dogs as i have i don't believe that is true. i have seen dogs with black dots on there tongues but i don't believe they have to be full bred to have a dot on there tongues.

I've not heard that before. What I have heard is that it's a solid indicator of a chow mix. Chow Chows apparently have either completely black or purple tongues. My puppy has a black spot on her tongue. However, her looks and behaviors are breed specific to Labrador Retrievers, which is what she is.......mixed with chow though.