![]() ![]() This trait has progressively been introduced in a growing number of, sometimes unexpected, breeds. Originally, the Merle trait was essentially produced in certain breeds, mainly from the herding group. The Merle coat can be described as a patchwork randomly composed of areas of full pigmentation combined with areas of lighter, diluted pigmentation. One of the most popular coat patterns in dogs is Merle. The need for future studies of numerous dogs from various breeds tested for Merle, piebald and medical-drug-resistance genes, and the beneficial effects that present and future research may have on the future of sensory impaired dogs, are discussed.ĭemographics and genetics of congenitally sensory impaired dogs Results about communication and activities are particularly optimistic. We however suggest that reports of neurological troubles could be partially accounted for by lacks of diagnosis of breed-related drug sensitivity and impairment-related compulsive behaviours. The results refute all above-listed assumptions, except for neurological troubles. Vision impaired dogs additionally exhibited ophthalmic abnormalities related to Merle. Most hearing and vision impaired dogs exhibited abnormal pigment deletion in their coat and irises. The questionnaire assessed demographics, morphology, sensory impairments, health and behavioural troubles, activities, and dog-owner communication. The sensory normal cohort was matched in age, lifetime with owner, breed and sex with the sensory impaired cohort, and was used as a baseline. We therefore addressed an online questionnaire to owners of 223 congenitally sensory impaired (23 vision impaired, 63 hearing impaired, 137 hearing and vision impaired) and 217 sensory normal dogs from various countries. However, there is no direct scientific testing, and hence no evidence or refutation, of these assumptions. These pessimistic scenarios result from popular assumptions predicting that dogs with congenital hearing/vision impairments exhibit severe Merle-related health troubles (cardiac, skeletal, neurological), impairment-related behavioural troubles (aggressiveness, anxiety), and poor capacities to communicate, to be trained, and to be engaged in leisure or work activities. The future of these dogs is often pessimistic (early euthanasia or placement in rescues/fosters, lack of interactions and activities for adults). Since this condition may be mistaken for a potentially serious problem, such as glaucoma or a neurologic condition, an examination with your pet’s veterinary ophthalmologist may be necessary.The births of domestic dogs with pigment deletion and associated congenital hearing and/or vision impairments are increasing, as a result of mutations of certain genes expressing popular coat colour patterns (Merle, piebald, Irish spotting). ![]() Some animals will exhibit sensitivity to and squinting with bright light when the iris atrophy is significant. Iris Atrophy is typically not a problem and rarely results in changes to a pet’s functional vision. ![]() In addition, iris atrophy can occasionally result in a “moth eaten” appearance to the iris. In these cases, the pupil may remain dilated, or large. However, iris atrophy will occasionally result in thinning of this muscle, which can eventually prevent the pupil from constricting. The iris has a muscle that allows the pupil to become smaller (like a camera aperture) when exposed to light to protect the retina in the back of the eye. The iris is the colored tissue inside the eye that surrounds the pupil (which is a circular structure in the dog and a slit-like structure in the cat). Iris Atrophy is an age-related thinning of the iris that commonly occurs in cats and dogs. ![]()
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