does anyone have a shetland sheepdog

[stacwase]

I think my sheltie is mutant! He's not barky at all. He never barks in the house. If somebody comes to the doors sometimes he'll make a "harrumph" noise but that's about it. Outdoors he'll bark if he sees kids playing because he wants to join them, and he'll bark if somebody strange comes to the door but that's about it. He's huge, too! Several people have asked me if he's actually a collie. But no - all his litter mates are normal-sized shelties.