Black and tan Labs

My stepfather-in-law's new guide dog is a black-and-tan Labrador. I had no idea such a thing even existed, and I've been around labs since I was in kindergarten.

So I did a little web searching, and this breeder has some fantastic pictures of these dogs. How do you make a Lab cuter? By having EYEBROWS. Also, look down the page for the Mosaic dogs--the one looks like he's got a little sweater on.

Genetics are weird. These are all purebred dogs.