Bentley has a double set of Canines,is this common? he looks so funny!!

We have tried to take a picture of him ,no luck!! He goes to the vet on Tuesday to get neutered,so vet will take baby teeth out too.I've had 3 other Yorkies before Bentley and none of them had double fangs!LOL.Anyone else's Yorkies have this? Bentley is 6 months old
Michelle