Your dog suddenly has fits of sneezing, snorting air backward in weird bursts, and pawing at his face like something's bothering him up there. There's no obvious cold, no foreign body you can see. The culprit might be something living right in his nasal passages: nasal mites.

Key Takeaways

• Canine nasal mites (Pneumonyssoides caninum) live in the nasal passages and sinuses and have been reported worldwide.
• Any dog can be affected, though dogs over 3 years old and large breeds may be somewhat more commonly diagnosed.
• Signs include nosebleeds, sneezing, "reverse sneezing," facial itching, nasal discharge, and noisy breathing.
• There's no risk to humans this mite only affects dogs (and has been reported in a silver fox).
• Diagnosis usually needs an endoscope exam and nasal flushing, since the mites aren't always easy to see.
• Antiparasitic medications are effective in more than 85% of cases, though there's no single universally recommended treatment.

What Are Canine Nasal Mites?

The canine nasal mite, Pneumonyssoides caninum (also called Pneumonyssus caninum), has been reported worldwide. According to the Merck Veterinary Manual, all breeds, ages, and sexes of dogs can be affected, though one report suggested dogs older than 3 and large-breed dogs may have a somewhat higher incidence. The mites live directly in the nasal passages and sinuses.

Transmission is thought to happen through both direct and indirect contact between dogs — so nose-to-nose greetings, shared bedding, or time spent in kennels, dog parks, or multi-dog households can all play a role. Studies from Norway and Sweden found infection rates between roughly 7 and 20% of dogs tested, so it's more common than most pet parents realise. There is no evidence this mite poses any risk to humans. and it's not considered zoonotic.

Signs of Nasal Mites in Dogs

• Bleeding from the nose (epistaxis)
• Sneezing
• "Reverse sneezing" — rapid, forceful inward sniffing
• A reduced ability to pick up scents
• Facial itching, or pawing at the nose and face
• Nasal discharge
• Laboured breathing
• Head shaking
• High-pitched, noisy breathing
• Less specific signs: coughing, restlessness, and, rarely, collapse

Because facial itching and pawing can look a lot like a skin allergy flare-up around the face, it's worth reading our guide on managing a dog's allergies at home if the itching seems more skin-deep than nose-deep the two can be tricky to tell apart without a vet exam.

How Are Nasal Mites Diagnosed?

Diagnosis relies mainly on endoscope examination of the nose and nasal flushing. A flexible scope lets the vet directly observe the nasal passages, while fluid collected from flushing can be examined under a microscope for the mites themselves. This matters because it's easy to suspect nasal mites purely from the symptoms, when several other conditions including tumours, fungal infections, and foreign bodies can look almost identical.

Other tests that sometimes help build the picture include blood and urine tests, nasal or dental X-rays, a CT scan, or a nasal biopsy. These are often done before endoscopy or flushing, since the procedures themselves can temporarily cause signs of respiratory irritation. Locating and identifying the actual mites matters treating for mites when the real cause is something else won't resolve the signs.

Treatment for Nasal Mites

There's no single universally recommended treatment, but several antiparasitic medications are effective in more than 85% of cases. Your vet will choose based on your dog's size, health status, and any breed-specific sensitivities some antiparasitic drugs need extra caution in certain breeds, including Collies, so this is squarely a vet-directed treatment rather than something to self-medicate.

Options your vet might use include vet-prescribed selamectin-based spot-on treatments such as Selamec Dog Spot-On, or an oral antiparasitic such as Neomec Tablet both are broad-spectrum antiparasitics used for various mite infestations under veterinary guidance, though the exact product and protocol for nasal mites specifically should always be confirmed with your vet rather than assumed from general antiparasitic use.

If treatment doesn't fully resolve the signs, it's likely that another upper airway condition is present alongside the mites or instead of them. Persistent facial irritation can also benefit from general skin and coat support; an omega-3/omega-6 supplement like Nutricoat Advance Syrup won't treat the mites themselves but can help calm accompanying skin irritation from constant pawing and rubbing.

Nasal Mites vs Other Causes of Sneezing and Nosebleeds

Several conditions can produce a similar picture, which is exactly why a proper diagnosis matters rather than guessing:

• A foreign body (grass awn, seed) lodged in the nose usually one-sided discharge
• Fungal infections such as aspergillosis
• Nasal or sinus tumours, more common in older dogs
• Dental disease affecting the nasal passages
• Allergic rhinitis
• Clotting disorders, which can cause nosebleeds without any nasal disease at all

A persistent cough alongside nasal signs is also worth tracking our guide on recognising and preventing coughing in dogs covers the broader picture of when a respiratory sign needs urgent attention versus routine monitoring.

Is It an Emergency?

Nasal mites themselves are not usually life-threatening, but certain signs deserve prompt veterinary attention rather than a wait-and-see approach:

• Heavy or repeated nosebleeds
• Laboured or noisy breathing that's getting worse
• Pale gums alongside nosebleeds a possible sign of significant blood loss
• Collapse

A little sneezed-out blood after a vigorous sneezing fit is common and rarely an emergency on its own. Heavy, ongoing bleeding, breathing difficulty, or a dog that seems unwell beyond the nose is different that combination needs same-day veterinary care.

Frequently Asked Questions

Can nasal mites spread to other dogs in the house?
Yes transmission is thought to occur through direct and indirect contact between dogs, so multi-dog households, shared bedding, and close contact can all play a role in spread.

Can humans catch nasal mites from a dog?
No. There's no evidence this parasite poses any risk to humans.

Why is it hard to diagnose nasal mites?
The mites aren't always visible or easy to locate, even with an endoscope, and many other conditions — tumours, fungal infections, foreign bodies cause very similar signs. Your vet may need several diagnostic steps to be confident in the diagnosis.

Does treatment always work?
Antiparasitic treatment is effective in more than 85% of cases where mites are confirmed. If signs persist despite treatment, it's likely another condition is present alongside or instead of the mites, and further workup is needed.

Are certain dog breeds more at risk?
There's no strong breed predilection overall, but one report found dogs older than 3 and large-breed dogs were somewhat more commonly affected than younger or smaller dogs.

References

1.  Merck Veterinary Manual — Canine Nasal Mites (Dog Owners). https://www.merckvetmanual.com/dog-owners/lung-and-airway-disorders-of-dogs/canine-nasal-mites
2. Merck Veterinary Manual — Canine Nasal Mites (Professional). https://www.merckvetmanual.com/respiratory-system/respiratory-diseases-of-small-animals/canine-nasal-mites
3. Merck Veterinary Manual — Rhinitis and Sinusitis in Dogs and Cats. https://www.merckvetmanual.com/respiratory-system/respiratory-diseases-of-small-animals/rhinitis-and-sinusitis-in-dogs-and-cats
4. SpectrumCare — Nasal Mites in Dogs. https://spectrumcare.pet/dogs/conditions/nasal-mites