Dr. Tiffany Delacruz, DVM • Chief Executive Officer, RexVet • 2026-07-04 • 10 min read
Dog Eye Infection: Causes, Home Care & When to Call a Vet — FL, NY & VA
Red, weeping, squinting eye in a dog has 5 real causes. FL/NY/VA licensed vets diagnose and prescribe by $64.99 video visit. Know when it's an emergency.
Medically reviewed by Dr. Tiffany Delacruz, DVM
A red eye in a dog is one of the top three fast-progressing conditions — behind bloat and heatstroke — that pet parents shouldn't wait on. Corneal ulcers can perforate within a day. Foreign bodies rub. Untreated bacterial infections spread deeper into the eye. This guide is for FL, NY, and VA dog parents to triage safely in the first hour.
The 5 realistic causes
- Bacterial conjunctivitis — most common. Yellow or green discharge, both eyes often affected, dog still opens the eye. Highly responsive to antibiotic drops.
- Allergic conjunctivitis — seasonal (spring pollen, fall ragweed) or year-round (dust mites, mold). Watery discharge, both eyes, itchy, dog rubs face on carpet.
- Corneal ulcer — scratch on the surface of the eye. Squinting, pawing, tearing, sometimes cloudy or blue cornea. THE ONE YOU CANNOT MISS.
- Dry eye (Keratoconjunctivitis Sicca / KCS) — often in Cavalier King Charles Spaniels, Cocker Spaniels, English Bulldogs, Pugs. Thick greenish-yellow discharge, chronic red eyes. Needs Schirmer tear test to diagnose.
- Foreign body — grass seed (foxtail), plant material, hair. Usually one eye only, sudden onset, obvious squinting.
Red flags — same-day in-person exam
- Squinting + pawing at the eye — corneal ulcer priority
- Cloudy, blue, grey, or white cornea
- Blood inside the eye (hyphema)
- Third eyelid pulled up covering half the eye
- Dog can't or won't open the eye at all
- Sudden vision loss (walks into walls, hesitant on stairs)
- Any red eye in a brachycephalic breed (Pug, French Bulldog, Bulldog, Shih Tzu) — proptosis and ulcer risk are much higher
The corneal ulcer rule — do NOT use steroid eye drops without a stain
Steroid eye drops (Neomycin-Polymyxin-Dexamethasone, BNP, and any drops with 'dex' in the name) suppress local immune response. If the eye has an ulcer and you apply a steroid drop, the ulcer can rapidly worsen and perforate — losing the eye. Every red eye deserves a 2-minute fluorescein stain in-person before steroid drops are prescribed. Telehealth vets who cannot stain will prescribe non-steroid drops (Neomycin-Polymyxin-Bacitracin, terramycin) or defer to in-person.
Home care while waiting for the vet
- E-collar (cone) immediately — pawing worsens every eye condition
- Clean discharge gently with warm water and a soft cloth or cotton ball, wiping away from the corner
- Do NOT use human eye drops (Visine, contact lens saline is OK to flush)
- Do NOT use leftover antibiotic ointments from prior conditions — expired or wrong-spectrum meds cause harm
- Take a photo before and after any home cleaning — helps vet track progression
Standard vet treatment by cause
- Bacterial conjunctivitis: BNP drops 4x/day for 5-7 days + e-collar
- Allergic conjunctivitis: antihistamine, non-steroid eye lubricant, plus oral Apoquel/Cytopoint if systemic
- Corneal ulcer: Neomycin-Polymyxin-Bacitracin (no steroid) 4-6x/day + atropine or NSAID for pain, recheck stain in 5-7 days
- Dry eye (KCS): cyclosporine (Optimmune) drops twice daily for life, plus artificial tears
- Foreign body: in-person removal under sedation, follow with antibiotic drops
Florida: grass seeds + humidity + allergens
Florida grass seeds and foxtails embed in dog eyes year-round. Any FL dog with a sudden squinting eye after a walk in tall grass — assume foreign body until proven otherwise. High humidity also drives bacterial conjunctivitis. Year-round pollen means allergic conjunctivitis is a 12-month problem for FL dogs.
New York: brachycephalic city breeds + winter dry heat
NYC has an outsized brachycephalic dog population (French Bulldogs, Pugs, Bulldogs) which have shallow eye sockets and higher ulcer risk. Winter indoor heating dries eyes and worsens KCS. NYC dog parents with flat-faced breeds should have a bottle of preservative-free artificial tears at home year-round.
Virginia: rural + tick disease overlap
VA rural dogs face grass seed exposure, and tick diseases (Ehrlichia, Rocky Mountain Spotted Fever) can cause anterior uveitis with red eyes as a symptom. Any VA dog with a red eye plus lethargy, tick exposure history, or fever needs tick disease testing along with the eye workup.
How telehealth fits
$64.99 RexVet video visits with FL/NY/VA-licensed vets are ideal for uncomplicated conjunctivitis triage (BNP prescription, allergic conjunctivitis management, dry eye maintenance refills for cyclosporine). Suspected corneal ulcer, cloudy cornea, foreign body, blood in eye, or any brachycephalic breed with sudden squinting — in-person same-day for fluorescein stain.
Emergency signals
When to contact a veterinarian
- Squinting + pawing at the eye — corneal ulcer priority
- Cloudy, blue, grey, or white cornea
- Blood inside the eye (hyphema)
- Dog can't or won't open the eye at all
- Sudden vision loss
- Any red eye in a brachycephalic breed (Pug, Frenchie, Bulldog)
- Red eye + lethargy or fever — possible systemic disease
Frequently asked questions
Can I use human eye drops on my dog?
Preservative-free saline (contact lens saline) is safe to flush. Everything else — Visine, redness relievers, antihistamine drops, dry eye drops — is not designed for canine eyes and can cause irritation, delayed diagnosis, or damage. Prescription veterinary drops are always the right choice.
Can a RexVet online vet treat my dog's eye infection?
Yes for uncomplicated conjunctivitis triage, allergic eye disease management, and dry eye (KCS) medication refills. $64.99 video visits with FL/NY/VA-licensed vets. Suspected corneal ulcer, cloudy cornea, foreign body, or squinting brachycephalic breed needs in-person same day for a fluorescein stain.
When is a dog eye infection an emergency?
Same-day in-person for squinting + pawing (ulcer), cloudy or grey cornea, blood in the eye, sudden vision loss, third eyelid stuck up, or any red eye in a brachycephalic breed. These need a fluorescein stain within hours.
Why can't my vet just prescribe steroid drops right away?
Steroid eye drops (any drop with 'dex' or 'pred' in the name) can cause a corneal ulcer to perforate — losing the eye. Every red eye deserves a fluorescein stain first to rule out an ulcer. Ethical vets stain first, prescribe second.
How long does dog conjunctivitis take to heal?
Uncomplicated bacterial conjunctivitis: 5 to 7 days on BNP drops 4x/day. Allergic conjunctivitis: 7 to 14 days on antihistamine and lubrication. Corneal ulcer: 7 to 14 days with recheck stains. Dry eye: lifelong management.
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About the author
Dr. Tiffany Delacruz, DVM
Chief Executive Officer, RexVet
Licensed veterinarian and CEO of RexVet (Rex Vets Inc.). Practicing across Florida, New York, and Virginia via licensed telehealth. Reviews every clinical article on RexVet before publication.