![]() Similarly, a dog with a spinal injury who is exhibiting Horner’s syndrome symptoms might have other neurologic signs like severe pain, visible wounds, internal injuries or paralysis. “For example, a dog with severe middle ear disease may have other symptoms (shaking head, scratching and discharge) along with the Horner’s syndrome.” “Some dogs have other symptoms along with the Horner’s syndrome, which helps us with diagnosis,” Dr. This cannot only determine if Horner’s syndrome is present, it can also help the vet pinpoint what might be causing it. Sometimes, a dog might only have a few symptoms, so the veterinarian might need to confirm the diagnosis by trying to dilate the pupil with special eye drops. “A diagnosis is usually made in the exam room, based on the findings discussed above,” Dr. How is Horner’s syndrome in dogs diagnosed? Rarely, the affected side might be warmer to the touch, and the skin might look “pinker” when compared to the unaffected side.One pupil that appears to be smaller than the pupil in the other eye and doesn’t dilate completely in dim/dark lighting.A protruding third eyelid that partially covers the side of the eye that’s closest to the nose.An eyeball that looks like it’s slightly sunken in the eye socket.A slightly drooping upper eyelid, which causes the eye on that side to appear slightly smaller than the other eye.Usually, all of these signs occur on the same side of the body. With Horner’s syndrome in dogs, you might notice a few distinctive signs. “The sympathetic pathway can be disrupted if there is an injury or disease disrupting the nerves anywhere along this pathway, including the brainstem, spinal cord anywhere down to the third thoracic vertebra, a disease outside the vertebral column in the neck, middle ear disease, or disease in the tissues behind the eye.” “When the sympathetic pathway to the eye is working properly, when stimulated, the muscles behind the eyeball will cause the eye to be forward in the socket, the eyelids open wide and the pupil dilated,” Dr. With Horner’s syndrome, damage to the sympathetic nervous system causes changes to the appearance of a dog’s eye and face. “The sympathetic component takes over when an animal is scared, frightened or anxious (the ‘flight or fight response’) and the parasympathetic component takes over during times of rest, relaxation and sleep.” ACVIM (Neurology), CCRT, owner of NEST Veterinary Neurology in San Clemente, California. “The nervous system has a sympathetic and a parasympathetic component,” explains Michelle Murray, DVM, MS, Dipl. Photography ©Vulkanov | iStock / Getty Images Plus. What is Horner’s syndrome? Dog eye closeup. Let’s learn more about the symptoms, diagnosis and treatment for Horner’s Syndrome in dogs. For additional information visit Linking to and Using Content from MedlinePlus.A sudden and drastic change to your dog’s face is alarming: a sunken eye, droopy eyelid, exposed third eyelid or a pupil that looks smaller than the other could mean your dog has Horner’s syndrome, a complex neurological disorder that affects the eyes and muscles of your dog’s face. Any duplication or distribution of the information contained herein is strictly prohibited without authorization. Links to other sites are provided for information only - they do not constitute endorsements of those other sites. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. This site complies with the HONcode standard for trustworthy health information: verify here. Learn more about A.D.A.M.'s editorial policy editorial process and privacy policy. is among the first to achieve this important distinction for online health information and services. follows rigorous standards of quality and accountability. is accredited by URAC, for Health Content Provider (URAC's accreditation program is an independent audit to verify that A.D.A.M. Injury to the carotid or vertebral arteryĪ.D.A.M., Inc.Tumor, mass, or lymph node in the upper chest or lymph node causing pressure on a nerve may cause decreased sweating, a small pupil, or drooping eyelid all on the affected side (Horner syndrome).Seizure (pupil size difference may remain long after seizure is over). ![]()
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