Here are some links to help you better understand the pros and cons of Merles. The debates are endless, but these are some of the most informational that I found. You decide for yourself. All we know is that we love our Merlot! Merlot is perfectly healthy! Except for her stinky breath. Which all Chihuahuas typically have because of their bad teeth.
http://members.cox.net/loveschihuahuas/merles.html Pro Merle
http://chihuahuamerles.com/ Anti Merle
http://www.chihuahuaclubofamerica.com/mrlstat.htm Anti Merle
http://www.artesteacups.com/TheMerle.html Great Article!