TL;DR: Most eyelid growths in dogs are benign meibomian gland tumors, but they should be evaluated by a veterinarian within a week to ensure they aren't damaging the eye surface.
What is a growth on my dog's eyelid margin and should I be worried?
Finding a bump on your dog's eyelid can be worrying, but these growths are very common, particularly in senior dogs. Most often, a growth on the eyelid margin is a meibomian gland tumor (a sebaceous adenoma), which is typically a benign growth of the oil-producing glands. Other possibilities include styes, cysts, or, less commonly, malignant tumors. Because these growths sit right on the edge of the eyelid, they can sometimes rub against the surface of the eye, causing irritation or even a corneal ulcer.
Is a growth on my dog's eyelid an emergency?
- The urgency level for a growth on the eyelid margin is Low; you typically do not need to rush to an emergency clinic.
- Schedule a non-emergency appointment with your veterinarian within the next week to have the mass evaluated.
- Seek care more urgently if your dog is squinting, pawing at the eye, or if there is significant redness and discharge, as these are signs of active eye damage.
Why is providing a photo helpful when triaging my dog's eyelid growth?
- Clear, well-lit photos allow a veterinary professional to see the exact location, size, and texture of the mass.
- Visual information helps determine if the mass appears benign or shows concerning characteristics that require urgent intervention.
- A photo helps the vet assess if the growth is currently touching the cornea, which allows them to prioritize your pet's appointment effectively.
Clinical Context (Merck Veterinary Manual)
In dogs, eyelid masses are mostly adenomas, with meibomian (sebaceous) adenocarcinomas being locally invasive and histologically malignant but not known to metastasize. Other frequent eyelid neoplasms include histiocytoma, mastocytoma, and papilloma, requiring biopsy to determine the best mode of therapy and prognosis. Lid melanomas, which appear as spreading pigmented masses on the eyelid margin or a mass within the lid, should be widely excised. The vast majority of canine eyelid neoplasms are treated successfully by surgical excision. Due to the possibility of recurrence, periodic reexaminations are recommended.
Chapter: Ophthalmology, Oncology
Source: The Merck Veterinary Manual, 11th Edition (Page 517)