We have a chocolate lab and the last thing we can call him is lazy!
So we can't suggest a labrador for a lazy pet.
We have a 1 year old chocolate lab as well. NOT LAZY.
Hyper, naughty, wild, yes - lazy, NO.
As for greyhounds, we have friends who have the sweetest rescue greyhound. She, sadly, is almost totally blind, since her previous owners, who were ONLY interested in racing her, never got her eye infection treated and as a result, she lost her eyesight. Her bad eye is larger than the other, and she can only tell who and where you are by smell and sound.

Gotta love em!