|Barked: Fri Nov 30, '12 1:36am PST |
|First off, I would like to apologize for posting under a different account. I registered yesterday and mis-typed my e-mail address. I starting adding my family before verifying it. Long story short, I couldn't access my last account and had to make a new one...Oops!
Anyway, a double merle is a dog that has two copies of the merle gene. A double merle can only happen when both parents are merles. Most of the time, but not always, double merles have hearing problems. Eye defects are also common, too. Some will have an irregularly shaped pupil. Although, this doesn't always mean that there is vision problems. Corectopia is the condition in which a pupil is mishappen and causes vision problems. Microphthalmia is the most common eye defect seen in double merles. However, both of these conditions rarely progress, so a puppy is born with the condition and lives without for their entire life, never getting worse. Double merles are more likely to have defects with their eyes then dogs of any other color. However, there are a good number of merle dogs out there with eye problems that do not have two copies of the merle gene. But, not all double merles have eye problems! Vision and eye problems are the only problems you have to worry about when having a double merle dog. Most double merles come from bad breeders. It happens when uninformed breeders breed two merles together, not knowing that about half of the puppies will end up being double merles and may end up being blind or deaf.
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