Transient mydriasis can be triggered by emotions and feelings or specific physiological changes. Do you see that your dog isn’t comfortable, yet also doesn’t whine, bark, or run circles around you? Take a quick look at their eyes: most likely, the pupils are going to be dilated. So, you may notice behavioral changes alongside your dog’s dilated pupils. This is important: mental responses like anxiety, fear, and excitement can all be causes of dilated pupils. If this doesn’t happen, you need to contact your vet. If the pupils only change in size to adjust to the light, that’s great news, since that’s the way it should always be! If you shine a bright light into your dog’s eyes, their pupils should constrict. However, for the average dog owner, it can be a bit tricky to figure out whether it’s just a normal reaction or something to worry about. It might be very obvious in blue-eyed dogs but not so much in dark-eyed dogs. Image Credit: Rhys Leonard, ShutterstockĮnlarged black dots are, of course, the most obvious sign here. However, if mydriasis appears only in one eye, it is mostly caused by an eye condition, and generally speaking, the pupil will stay dilated for a long time and won’t be affected by changes in light. If dilation is a response to dim light, emotions, or a mental state like fear or excitement, the pupils will dilate and constrict (go back to their regular size) evenly and swiftly. Mydriasis can be bilateral or unilateral, but in normal circumstances, both pupils are the same size. So, if your dog gets back home after a long run outside late at night, their pupils will “shrink” to adjust to above-average brightness levels.Īlso, it doesn’t always happen in both eyes at the same time. The stronger the light, the narrower the pupils get, and vice versa. This is the eye’s natural response to changes in light intensity. In normal circumstances, the pupils get bigger and smaller all the time. The term “mydriasis” is used to describe a scenario when the pupils become abnormally large. The pupil is the black “dot” or “hole” in the middle of your dog’s iris (the colored part of the eye). So, how worried should you be about it, exactly? How do you know that the dog does, indeed, have dilated pupils? Can you try and fix this issue by yourself, or should you seek immediate medical attention for the four-legged bud? In this article, we’ll go over the very definition of pupil dilation, the most obvious signs, causes, and tried-and-true remedies. While it might be caused by excitement, sometimes, it’s triggered by fear, stress, and pain, or a medical condition such as poisoning, infection, or a severe eye problem like glaucoma. The same can’t always be said about dilated pupils, though. Very few things are as heart-warming as a pup with beautiful wide open eyes looking at you with affection.
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