TL;DR: Swelling and hair loss around the eyes are common signs of blepharitis and typically require a veterinary exam within 24–48 hours. Immediate attention is needed if you notice eye cloudiness, excessive squinting, or thick discharge.
What causes swelling and hair loss around my dog’s eyes?
Swelling, redness, and hair loss around a dog's eyes often point to a condition called blepharitis, which is an inflammation of the eyelids. This can be caused by various factors, including:
- Environmental allergies
- Bacterial infections
- Parasites like Demodex mites (mange)
- Self-trauma and irritation from the dog rubbing their face
Is swelling and hair loss around my dog’s eyes a veterinary emergency?
Urgency Level: Low. In most cases, these symptoms are not immediate life-threatening emergencies, but they do require a scheduled veterinary visit within 24 to 48 hours. You should seek more urgent care if you notice:
- Excessive squinting or signs of pain
- A cloudy appearance to the eye itself
- Thick green or yellow discharge
- Potential signs of a corneal ulcer or deeper infection
How does sharing a photo of my dog's eyes help with veterinary triage?
Taking a clear, close-up photo of your dog's eyes is one of the most helpful things you can do for a triage professional because it:
- Allows us to see the exact distribution of hair loss and the severity of the swelling.
- Provides a detailed visual without causing your dog additional stress.
- Helps us differentiate between simple skin irritation and more serious ocular issues.
- Ensures your pet gets the right level of care at the right time.
Clinical Context (Merck Veterinary Manual)
In dogs, swollen, red eyelids with hair loss (blepharitis) can be caused by extension of generalized dermatitis, conjunctivitis, local glandular infections (stye or chalazion), or irritants. Common agents involved include dermatophytes, Demodex canis, and bacteria such as staphylococci. Immune-mediated diseases such as pemphigus can also manifest lesions at the mucocutaneous junction of the skin and conjunctiva. Systemic therapy is often indicated in addition to topical treatment for generalized blepharitis, alongside supportive therapy of hot packing and frequent cleansing. Skin scrapings, cultures, and biopsies may be required for accurate diagnosis.
Chapter: Ophthalmology, Dermatology
Source: The Merck Veterinary Manual, 11th Edition (Page 490)