I have a couple of patterns. Two of them are from Silver Linings One pattern is for 2 8x10 blocks,
http://www.silverliningsoriginals.com
The other is an 8" block
The third pattern is from Malec Designs
http://www.malec-designs.com This has 2 dogs on it, a yellow and a black and it is 11x17"
If you need something bigger you may just have to enlarge the patterns
I have 3 labs. Two that are white and one black.