X-ray and ultrasound are useful for showing some types of injury, and can usually be done quickly in a vet’s office. If the veterinarian suspects a tumor, broken bone or injury, medical imaging will be needed. These tests will help the veterinarian to determine the underlying cause, if any, of the droopy eye. The veterinarian will perform a number of routine tests, usually an analysis of a urine sample, a CBC (an analysis of a blood sample to count the types of cells and their relative proportions), and of course a physical exam. Tell your veterinarian if your dog has recently had a tumor or any surgery. The veterinarian will want a history of any activities your dog has engaged in that might result in injury, and any observations you may have of abnormal behavior in your dog. If you notice your pet’s eye exhibiting the above signs, you will need to see a veterinarian to make sure there are no associated conditions causing Horner’s syndrome. While not serious on its own, Horner’s syndrome may indicate problems with the nervous system. The pupils will be small, the eyelid partially closed, and the 3rd eyelid will be elevated and protruding slightly. While somewhat unsightly, Horner’s syndrome on its own may not present a serious risk for your pet.Horner’s syndrome refers to a nervous system disorder affecting the eye. However, in breeds like Golden Retrievers, Horner’s syndrome may present idiopathically, that is, without any identifiable cause. This syndrome indicates a lack of nervous system communication and may reflect a deeper problem, especially if your dog is having difficulty walking or swallowing. Finally, the “3rd eyelid” or nictitating membrane located inside the lower eyelid may appear inflamed or push out, leaving a reddened area above the lower eyelid. The pupil may be very small and unable to open in response to lowered lighting. First, the dog’s upper eyelid may appear to droop or not fully open. “Droopy eye” is a condition in which the nerves to a dog’s eye have been inflamed or damaged, and may be a sign of what is called 'Horner's syndrome'.

Droppy ear dog