http://yeshuachi.homestead.com/Merles.html
This site is about Australian Shepherds but very informative.
http://www.lethalwhites.com/merle.html
This next site is very scientific I found it very informative about the Merle gene in any mamal mostly Australian Shepherds but that any mamal can throw Merle.
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1431520
There are even Merle Mice as you can see on this site.
http://www.afrma.org/micemkd.htm
Keep in mind these are pedigree mice through AFRMA. I have raised mice and hamsters for years so this is very interesting to me. I hope you enjoy all the info. Also here are two forums that are Merle friendly at least I have enjoied the some of the post here.
http://activeboard.com/forum.spark?forumID=97324 This is chihuahuacrossing.com They are cool but I haven't visited recently.
http://merlechihuahua.proboards24.com/index.cgi I like this forum to so maybe you guys will to. I hope you will always come back to The Chi Chat Lounge to vist often. Enjoy these links.