In a genetics discussion on another site, we had a discussion about mismarked Labradors. Apparently, purebred Labs can have tan markings, white or black spots, and a somatic mutation that causes them to expression both base coats at the same time. (ex. black and yellow being displayed). I find this to be interesting. Here are some sites that show pictures and infomation about these dogs.
Shows different “mismarked” Labs
http://www.woodhavenlabs.com/mismarks.html
http://www.blueknightlabs.com/content/view/76/113/
Black and Tan Labs
http://www.guidingeyes-md.org/Misc%20Files/Black%20and%20Tan%20LabradorsBCWEB.htm
Explains the genetics of Lab coat colors
http://www.labbies.com/genetics2.htm
While this site here is mainly about Aussies, it does have pictures of a mosiac (somatic mutation) Lab.
http://www.ashgi.org/color/Aussie_somatic_mutations.html
