Brindle

Banjo started out as black and white but the older he gets (he's only 4.5 months) the more I notice brindle coloring coming in. Anyone have any clue if the brindle takes over or if he's just a patchwork kind of guy with black and white and brindle? I've never seen a bt with half brindle half black and white before so I really have no idea why coloring he'll have.

In other news he starts puppy preschool tonight. Now for me to work up the patience for this event....(I'll be taking him in about 30 minutes early to burn off some of his energy).