Saje, Hammie's black spot started as something very small....the size of a mole on his tongue at around 8 mos. old. Next thing I knew...it was growing!! I was also soooooo worried about something awful, like a cancer..so I posted a pic (not a good one cause he kept turning his head) but it's in my gallery so take a look and see if it's similiar. I couldn't understand why the vet didn't say anything about it, but turns out that black spots are normal for any dog predominantly black in color. Also common in GSDs (Hammie is mostly black, too) He now has 2 black spots.......they still annoy me cause they just look awful! It isn't even abnormal for some dogs to have a black tongue....YIKES. Since you are taking Maverick for a check-up anyway...you'll feel better having it checked.