Guinea Pig Ear Mites: Symptoms, Treatment, Cross-Species Risk
Ear mites in guinea pigs are much less common than the static-mite or sarcoptic mange that dominates the guinea pig literature, but Psoroptes cuniculi and Otodectes cynotis are reported, especially in pigs co-housed with rabbits or dogs. Affected pigs scratch one or both ears, develop crusty brown debris in the ear canal, and may shake the head (AEMV Pet Care Guides, 2024). Topical or injectable ivermectin clears most infestations in 2 to 3 weeks.
Last reviewed: June 2026
How Guinea Pigs Get Ear Mites
The two ear mites encountered in pet guinea pigs are Psoroptes cuniculi — the same rabbit ear mite — and Otodectes cynotis — the common cat and dog ear mite. Both reach guinea pigs through direct contact with infected rabbits, dogs, or cats sharing a household, or through contaminated bedding, brushes, or carriers. Strictly indoor guinea pigs with no contact with other species are very rarely affected. Hay sourced from a barn with infested rabbits is a less common but documented entry point.
What Owners See
The most consistent signs are head shaking, repeated ear scratching with a back foot, and dark brown or rusty crumbly debris accumulating in one or both ear canals. The ear pinna may appear red, swollen, or thickened at the base. Some pigs develop matted fur around the ears from constant scratching. Severe infestations involve the skin around the ear and the back of the neck and produce open scratch wounds. Secondary bacterial infection — yellow purulent debris, foul odor, head tilt — is a sign things have gone past simple mite infestation.
Differentiating From the Other Mite You Hear About
Trixacarus caviae is the much more famous guinea pig mite, but it lives in the skin of the trunk and produces the classic intensely itchy back-and-sides mange. T. caviae rarely affects the ears specifically. As described in Quesenberry & Carpenter's Ferrets, Rabbits & Rodents, a pig presenting primarily with ear scratching, ear debris, and head shaking should be worked up for Psoroptes or Otodectes rather than assumed to have T. caviae. Skin scrapings of the ear canal debris under microscopy distinguish the species.
Diagnosis
Otoscopic exam reveals the dark crumbly debris and sometimes visible moving mites. Microscopic exam of a swab from the ear canal — placed on a slide with a drop of mineral oil — identifies the specific mite species. A complete dermatologic workup, including skin scrapings of the trunk to evaluate for T. caviae and Cheyletiella, is standard because mixed parasitism is common.
Treatment That Works
Ivermectin 0.5 mg/kg subcutaneously or 0.4 mg/kg orally given every 7 to 10 days for 3 doses clears the great majority of Psoroptes and Otodectes infestations. Topical selamectin applied to the back of the neck is also effective and is convenient for owners who prefer not to inject. Treat all in-contact animals — rabbits, other pigs, and cats or dogs in the household — at the same time to prevent reinfection. Cross-species parasite consideration is emphasized in current exotic mammal husbandry guidance (AEMV Pet Care Guides, 2024) and in concurrent feline parasite recommendations (AAFP-AAHA Feline Life Stage Guidelines, 2021). Wash bedding, fleece liners, and cozies in hot water at 60°C and discard or thoroughly clean toys.
Cleaning Without Causing Harm
Resist the urge to scrub debris out of the ear canal aggressively. Gentle flushing with warm sterile saline under veterinary supervision is appropriate; over-the-counter pet ear cleaners with strong drying or alcohol-based formulations can irritate the thin canal lining. Anti-inflammatory drops or a short course of oral meloxicam may be added if the ear is inflamed and painful, again under veterinary direction. Avoid mineral oil floods of the canal in pigs with head tilt or suspected eardrum damage.
When to See a Vet
Call your vet today if:
- Persistent ear scratching for more than 2 to 3 days
- Brown or rusty crumbly debris visible at the entrance of one or both ears
- Head shaking or tilting to one side
- Open scratch wounds around the ear or neck
- Other pets in the household (rabbit, dog, cat) have known ear mites
Go to the ER immediately if:
- Sudden severe head tilt with loss of balance or rolling
- Yellow or green pus from the ear with high fever and lethargy
- A pig that has stopped eating and producing droppings for 12+ hours along with ear signs
- Sudden inability to walk straight
- Severe respiratory distress with any other systemic signs
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Frequently Asked Questions
Can my guinea pig catch ear mites from my rabbit?
Yes — Psoroptes cuniculi crosses readily between rabbits and guinea pigs sharing a household. When one species has confirmed ear mites, the other should be examined and typically treated concurrently. Keeping rabbits and guinea pigs in separate enclosures reduces but does not eliminate transmission, especially through shared brushes, towels, and human hands.
How much does ear mite diagnosis and treatment cost?
Initial exotic vet exam typically runs $75 to $200, since exotic exams price about 1.5 to 2 times standard. Otoscopic exam and microscopic ear cytology add $40 to $120. Ivermectin treatment for a guinea pig costs $30 to $80 total for the 3-dose course. Topical selamectin runs $40 to $100. Treating all in-contact animals adds $30 to $100 per animal. Secondary bacterial ear infection treatment with cytology and culture can run $150 to $400.
Are ear mites contagious to humans?
Both Psoroptes cuniculi and Otodectes cynotis can produce transient itchy skin reactions in humans handling heavily infested animals, but human infestation is self-limiting because the mites cannot complete their life cycle on human skin. Wash hands after handling, and a household with persistent skin itch in people should consult a physician — but the cure is in treating the pets, not the humans.
Will the mites come back?
Reinfestation is the leading cause of treatment failure. The most common sources are an untreated rabbit or cat in the household, persistent mites in cage furnishings, and incomplete treatment courses. Treating every in-contact animal simultaneously, washing all soft furnishings in hot water, and completing the full 3-dose ivermectin protocol prevent most relapses.
Can I use my dog's ear mite drops on my guinea pig?
Some canine ear products contain selamectin or moxidectin that are effective in guinea pigs, but dose, formulation, and other ingredients differ. Do not apply a canine product without veterinary guidance — guinea pigs are sensitive to several common topical ingredients and inappropriate dosing has caused toxicity.
Still Not Sure if Your Guinea Pig Needs a Vet?
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