Here are some of the other possible causes of anisocoria in dogs presenting with unilateral mydriasis:Īsymmetrical pupil size in a dog may also be due miosis, or one pupil contracting rather than one dilating. This may be caused by degenerative, infectious or other disorders in the eye. Sometimes, the cause of a dog's dilated pupil is in the eye itself. When there is head trauma involved, anisocoria is a veterinary emergency should be treated at once. The prognosis is reserved and, in serious cases, the dog may die. When assessing the origin and characteristics neurological disorders and injuries, the vet will need to thoroughly examine the dog, performing a neurological exam and using appropriate diagnostic imaging techniques. This may be the result an accident, for example if the dog suffers a heavy blow or fall from a great height. If a dog has only one dilated pupil, this can give the vet clues about the possible cause.Īpart from head trauma, anisocoria in dogs may be caused other traumas such as a cervical spine injury. Therefore, if you notice this symptom it is crucial to go to the veterinarian. If you dog has one pupil smaller than the other, this indicates a problem.Īsymmetrical pupil dilation in dogs - formally known as anisocoria - may indicate a brain injury or infection such as meningitis,which usually has a poor prognosis. Normal pupils are symmetrical and dilate and contract together depending on the amount of light. Pupil dilation is also called mydriasis and can be unilateral or bilateral, that is in one eye or both. If your dog has dilated pupils in bright light here are the possible reasons: Pupil dilation in dogs does not necessarily signify a problem, as pupils naturally dilate to allow more light to enter, at dusk or under dim lights, for example. This allows them to see moving objects especially effectively. These impulses reach the brain via the optic nerve, allowing the dog to process what is sees.ĭog pupils are large in size compared to human pupils, and provide a wide visual range. Light reaches the retina is transformed into electrical impulses with the help of photoreceptor cells. This is a muscular membrane that opens and closes, working like a camera aperture, to regulate the amount of light that hits the retina. In a dog's eye, the pupil is the round opening at the center of the iris.
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