I think I have seen one on Quilters Cache - I will have a look & check back :)

Found it ...
http://www.quilterscache.com/B/BlackLabBlock.html

Here is a link to books by Darcy Ashton.

http://ashtonpub.com/books.htm#BBD

Scroll down about half way and you will see the dog book. There is a black lab on the upper left corner of the book. I have the book and the lab on the front is the same one that the pattern is of, on the inside.