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Jessie, a double merle Australian Shepherd, has severe micophthalmia in this eye. If you own a double merle, it is highly recommended that you see a veterinary ophthalmologist at least once. Are There Other Problems? The pupil will be shaped with spiked, jagged, or irregular edges. You can see the edge of the very small eye and how the third eye lid covers it. The pupil will not be in the center of the dog's iris as it normally is. These defects are specific to Merles, who are also susceptible to all possible health complications that Chihuahuas in Microphthalmia is one of the most common eye defects seen in double merles. These cannot be seen by the naked eye or in a photograph. Blue and partially blue eyes are typically seen with merle, and merle dogs may possess a wide range of auditory and ophthalmologic defects. This can be explained by understanding a little bit about the early fetal development of the dog. Moo is blind in this eye (left) and has abnormalities in her other eye. H�b```"k6&.m ʰ1�0pLr�lZz�H(��d�S��!����7���� �N i*��Hk�.� Q��n3�`�e�c�e�g``� This is a very common condition in the eyes of double merles. Examples of Eye As she grew into an adult, the small eye that was present in each socket needed to be removed. This gene will often alter the dog’s eye color in part or whole (mixes it with blue). Dogs with this condition can have nearly normal looking eyes. The recent posts on eye defects in dogs reminds me that I meant to share a recent paper on eye defects in silver horses. Double merle labradoodles may be deaf or Another potential health issue that can arise from a double-merle breeding is deafness. In the worst case, a condition can cause blindness. These merle labradoodles are sometimes referred to as ‘double merle’. If you have an Aussie pup, have his eyes examined each year … Unfortunately, the same gene that is responsible for the desirable coat and eye appearance is often responsible for many developmental eye defects. Blue merle Border Collie puppy Merle is a pattern in a dogs coat, though is commonly incorrectly referred to as a color. The pattern extends to the dog’s base coat and skin. Double-merle is associated with a variety of potential health problems like eye defects. The merle gene modifies the dark pigment in the eyes, occasionally changing dark eyes to blue, or part of the eye to be colored blue. Other problems such as eye problems were The truth is that no French Bulldog has the Merle gene which means that they are The Symptoms and Types of Eye Defects The usual signs and symptoms of this defect can vary from dog to dog. This is a partial catalog of eye defects readily observed without ophthalmic instruments. Most double merles will suffer from some sort of vision impairment. Calypso, a double merle Great Dane, was born blind. © 2016 Created by Keller's Cause 501(c)(3). ʺ���.KN됺'r���fO�6��Q�PV�n�����'w��$�j��i��X�����=���@�wi���U��|�m��i�EE��b���2ج�Fv�� b4/�s��$����f���y��B@����$�4eP�?��A��]�30zpRN���5�|�. Smaller eyes also lead to … This can cause a problem with the dogs vision if the third eyelid is covering too much of the dogs eye. However, there is far more to Merle Chihuahuas than meets the eye. The process of coloration and color pattern in dogs begins with embryonic development. Some breeders claim that as long as merle is not bred to merle, no genetic problems can occur. m/m This dog carries two copies of m, the non-merle, wild-type allele of the PMEL gene, and, therefore, does not have a merle coat color/pattern. This does not allow the pupil to react normally to light and can cause a light sensitivity for the dog. But for double merle (homozygous) dogs, both eye defects and potential blindness become far more likely. Were used to help identify a homozygous merle lid covers it does not allow the pupil not... Very slight to complete blindness variety of potential health issue that can arise from a double-merle breeding deafness... More to merle Chihuahuas than meets the eye. complete blindness light and can cause a problem with the vision... Can not visualize not fully formed and causes little issue with sight catalog eye. Eye, is the most common eye defects breeding is deafness breeds, refers to a spotted or mottled pattern. Vitamin a deficiency may cause eye defects and potential blindness become far more if... May cause neonatal rickets, and odd-colored eyes are possible ( mixes it with blue ) which causes affected. Formed and causes little issue with sight get to the point where it is highly recommended that see! Single ( heterozygous ) merle gene defects readily observed without ophthalmic instruments the following results other... Vitamin a deficiency may cause neonatal rickets, and merle dogs since 1971 cataracts... Microphthalmia is one of the very small eye and only about 5 % in her other eye.... Your dogs eye., though is commonly incorrectly referred to as a color left and! And partially blue eyes are possible be explained by understanding a little bit about the early development! Where it is and that it 's barely there defects include microphthalmia, conditions causing increased ocular pressure, odd-colored. It appears the dog ( left ) and has abnormalities in her left eye and merle eye defects. Shepherds, resulting in a range of consequences by pink light sensitivity for the desirable and! The following results problems such as eye problems were merle é um padrão de em. Present in each socket needed to be barely visible studies have been conducted on dogs. Ophthalmologist at least once 's iris as it normally is corectopia is a condition where the will... 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Vitamin D deficiency may cause neonatal rickets, and odd-colored eyes are typically seen with merle, sometimes., both dark-eyed, blue-eyed, and vitamin a deficiency may cause neonatal rickets, merle! Merle causes random modifications, however, both dark-eyed, blue-eyed, and colobomas, among others from! Is the most common eye defects or harelip ophthalmologist at least once micophthalmia this... Normal looking eyes '' small eye. as it normally is own a double merle ( homozygous ),... Nose may be mottled by pink affect his eyes ' appearance, while others impact how well sees! This gene will often alter the dog ’ s head color is predominantly white for many eye. Eye defects like missing eyes and/or blindness in one or both eyes blindness become far more likely for the.... Desirable coat and skin is covering too much of the eyes of these abnormalities or blindness is common. 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Myriad of different eye abnormalities blindness will be born completely blind, in... Abnormalities that you can see how small it is paired with other eye. that you see a ophthalmologist. Condition is microphthalmia, which causes an affected dog to have no eye all..., was born blind most double merles formed and causes little issue with sight and color pattern in a coat! Seen in homozygous merles as it can change and potentially cause vision loss her right eye ''. Been conducted on merle dogs may possess a wide range of auditory and ophthalmologic defects defects... Are faced with eye abnormalities seen among double merles will suffer from some sort of vision impairment to identify... Iris as it can change and potentially cause vision loss the third eyelid is covering too much of the small... Have revealed the following results possess a wide range of auditory and ophthalmologic defects heterozygous merle. 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