Animal Lovers

Ok Dopers-
I need some help here.
Is anyone familiar with the show “Good Dog University”. If so, what breed of dog is Duke?

For those unfamiliar with the show here is an address to find a picture of Duke.
Anyone know?
http://home.earthlink.net/~stevemartins/JOEL.htm

I think Duke is a mix…his face looks like a Ridgeback, but he’s too shaggy. Part German Shepherd, maybe?

I love Animal Planet, especially the vet shows. But I have to quick! turn the channel if Crocodile Hunter comes on. Boy, is that show annoying.

Looks like a Heinz 57, to me.

Or a Pink Penis Peeper Puppy.