The Four Main Canine Mite Infestations
Canine mite infestations are common dermatological conditions that span from routine (otodectes ear mites, localised demodex in puppies) to highly itchy and zoonotic (sarcoptic mange). The four main types:
1. Demodicosis
*Demodex canis* — a commensal mite that lives in hair follicles of all healthy dogs in small numbers. Overgrowth occurs in:
- Genetically predisposed young dogs (localised juvenile form)
- Immunosuppressed adults (generalised adult-onset)
NOT contagious (commensal mite). Two forms:
- Localised: few isolated patches, young dog, often self-resolves
- Generalised: whole body or whole foot involvement, often indicates underlying disease in adults
2. Sarcoptic Mange (Scabies)
*Sarcoptes scabiei* var *canis*. Highly contagious, intensely itchy, zoonotic (humans get transient itchy papules).
Classic distribution: ear margins, elbows, hocks, ventrum, eye rims.
3. Cheyletiellosis (“Walking Dandruff”)
*Cheyletiella yasguri* (dog), *C. parasitivorax* (rabbit). Mites visible in scale moving across skin. Dorsal distribution. Zoonotic transient.
4. Otodectes (Ear Mites)
*Otodectes cynotis*. Highly contagious between dogs and cats. Dark waxy ear discharge + intense ear scratching/head shaking.
The Critical Discriminator – Itch Severity
“Demodex doesn’t itch; sarcoptes itches like hell” — clinical aphorism that holds up most of the time.
| Mite | Itch severity |
|---|---|
| Sarcoptes | SEVERE — dog cannot stop scratching, often distressed, may cause self-trauma |
| Cheyletiella | Moderate |
| Otodectes | Severe but localised to ears |
| Demodex (uncomplicated) | Minimal — non-pruritic |
| Demodex with secondary pyoderma | Moderate-severe — from infection, not mite itself |
Severe whole-body itching in a dog suggests SARCOPTES until proven otherwise.
Distribution Patterns – The Other Key Discriminator
Sarcoptes Distribution
- Ear margins (helical edges)
- Elbows
- Hocks
- Ventral abdomen
- Eye rims
- Spares the dorsum and back (initially)
- Self-trauma can extend lesions anywhere
Localised Demodex Distribution
- Face (especially around eyes, mouth)
- Head
- Forelimbs
- Few isolated patches (<5 lesions; <2 body regions)
- Typically young dog (<12 months)
Generalised Demodex Distribution
- >5 lesions OR 2+ body regions OR whole foot involvement (pododemodicosis)
- Whole body in severe cases
- Often dogs >18 months progressing from localised, OR adult-onset (indicates immunosuppression)
Cheyletiella Distribution
- Dorsum (back)
- Scaling moves with mites visible (“walking dandruff”)
Otodectes Distribution
- Ears only (dark waxy “coffee grounds” discharge)
- Intense head shaking and ear scratching
Diagnosis
Demodex
- Deep skin scrapings at multiple sites (squeeze skin to express mites from follicles)
- Trichograms (hair plucks) — mites visible at hair root
- Skin biopsy for deep or chronic cases
- Multiple mites on scrapings confirm diagnosis
Sarcoptes
- Superficial skin scrapings — often FALSE NEGATIVE due to low mite numbers
- Earflap pinnal-pedal reflex — rubbing the ear margin causes hind-leg scratching reflex (highly suggestive but not diagnostic)
- EMPIRICAL TREATMENT response often diagnostic — clinical improvement within 2-4 weeks with isoxazoline confirms sarcoptes
Cheyletiella
- Scale collection + microscopic exam
- Acetate tape impressions
- Visible “walking” mites in fresh scale
Otodectes
- Ear swab cytology — mites visible under microscope
- Otoscopic exam — mites sometimes visible moving in ear canal
The Isoxazoline Revolution
The isoxazoline class (Bravecto – fluralaner, NexGard – afoxolaner, Simparica – sarolaner, Credelio – lotilaner) has revolutionised canine mite treatment:
- Single oral dose often curative for sarcoptic mange
- Highly effective for demodicosis with monthly dosing
- Safe across breeds — NO MDR1 contraindication (unlike high-dose ivermectin)
- Already used for flea/tick prevention in many dogs — covers mites incidentally
- Largely replacing older ivermectin / amitraz / moxidectin protocols
Off-label use for mites in many markets but well-established evidence base with high cure rates.
Demodex Treatment Detail
Localised Demodicosis (Young Dog)
Often self-resolves within months — about 50% of localised cases resolve without treatment.
Conservative management:
- Monitor monthly with re-scraping
- Treat secondary pyoderma if present (cephalexin / amoxicillin-clavulanate 2-6 weeks)
- No corticosteroids (suppress immune response further, worsen demodex)
- No immunosuppressive medications if possible
Some clinicians treat with isoxazoline anyway given the excellent safety profile and high cure rate.
Recheck monthly — if progresses to generalised, escalate treatment.
Generalised Demodicosis
Definitive treatment:
- Isoxazoline (preferred) — Bravecto, NexGard, Simparica, Credelio; monthly dosing typical
- Ivermectin (NOT in MDR1 breeds) — historical standard; 0.3-0.6 mg/kg q24h
- Moxidectin topical (Advocate / Advantage Multi) — weekly
- Amitraz dips — historical; less commonly used now
Monthly skin scrapings until 2-3 consecutive NEGATIVE scrapings — then continue treatment 1-2 more months before stopping (mites can rebound).
Treat secondary pyoderma: cephalexin 22 mg/kg q12h or amoxicillin-clavulanate 12-25 mg/kg q12h for 4-8 weeks (longer for deep pyoderma).
Adult-Onset Generalised Demodicosis
Dog >4 years with new generalised demodex almost always indicates underlying disease causing immunosuppression:
- Cushing’s disease (hyperadrenocorticism) — most common; see PuppaDogs Cushing’s Calculator
- Hypothyroidism
- Neoplasia (especially lymphoma)
- Immunosuppressive medications (corticosteroids, chemotherapy, ciclosporin)
- Severe metabolic disease
Full workup: senior bloodwork (CBC + biochemistry + thyroid + UPC); ACTH stim or LDDS for Cushing’s; abdominal ultrasound; medication review.
Treat underlying disease alongside mite treatment — mite treatment alone less effective if immunosuppression continues.
Sarcoptes Treatment Detail
Isoxazoline is now standard of care:
- Single oral dose of Bravecto (fluralaner) often curative
- NexGard, Simparica, Credelio at monthly intervals
- Selamectin (Stronghold/Revolution) topical every 2 weeks for 3 doses
- Moxidectin (Advantage Multi/Advocate) topical
- Lime sulphur dips — older alternative
Treat all in-contact dogs simultaneously.
Decontaminate environment — wash bedding hot, vacuum thoroughly. Mites survive only a few days off-host.
Zoonotic warning: humans develop itchy papular rash where contact occurred (arms, abdomen, thighs). Resolves with treatment of the dog (mites don’t complete life cycle on human skin). Symptomatic relief: topical steroid, oral antihistamine. Inform household + GP if itching develops.
MDR1 Caution
HIGH-DOSE IVERMECTIN (used historically for demodex at 0.3-0.6 mg/kg q24h) is FATAL in MDR1 affected dogs.
Standard heartworm doses are safe (much lower).
For mite treatment in MDR1 breeds, isoxazolines are SAFE and effective alternative — no MDR1 contraindication.
MDR1 breeds:
- Collie (Rough and Smooth)
- Australian Shepherd / Mini Aussie
- Long-haired Whippet
- Shetland Sheepdog
- Old English Sheepdog
- English Shepherd
- Some Border Collies, German Shepherds
DNA testing for MDR1 recommended in at-risk breeds.
Demodex Heritability
Predisposition to demodicosis is HERITABLE. Affected dogs should NOT be bred.
Breeds over-represented in case series:
- American Staffordshire Terrier / Staffordshire Bull Terrier / American Pit Bull Terrier
- English Bulldog / French Bulldog
- Boston Terrier
- Chinese Shar Pei
- Pug
- Boxer
- West Highland White Terrier
- Old English Sheepdog
- Great Dane
- Airedale Terrier
- English Pointer
- Scottish Terrier
- Collie
Otodectes Treatment
Most monthly broad-spectrum parasiticides treat ear mites:
- Selamectin (Revolution/Stronghold) — single topical dose
- Milbemycin oral
- Moxidectin (Advantage Multi/Advocate) topical
- Isoxazolines off-label but effective
For confirmed mites:
- Clean ear canals of debris
- Apply parasiticide
- Monthly preventive going forward
- Treat all in-contact dogs and cats — highly contagious between species
- Re-treat at 2-4 weeks
Cheyletiella Treatment
Similar approach:
- Isoxazolines effective
- Selamectin monthly
- Moxidectin monthly
- Lime sulphur dips alternative
Treat all in-contact pets + decontaminate environment + inform humans (transient itchy papules; resolves with treatment of source).
Honest Caveats
- Sarcoptes superficial scrapings often false-negative — empirical treatment response is diagnostic
- Demodex requires deep scrapings — superficial misses
- Generalised demodex in adult dogs always warrants underlying disease workup
- Isoxazoline use for mites is off-label in many markets — widely accepted but check local regulations
- Treatment failure often due to secondary pyoderma not being treated, or underlying immunosuppression not addressed
- This calculator helps you understand the framework — definitive diagnosis requires vet examination + scrapings/cytology
Conclusion
Canine mite infestations are common and largely treatable — but the four main types (demodex, sarcoptes, cheyletiella, otodectes) require different approaches and have different implications. The critical discriminator is itch severity — sarcoptes is intensely itchy, demodex is not. The isoxazoline class (Bravecto, NexGard, Simparica, Credelio) has revolutionised treatment — single dose often curative for sarcoptes; monthly dosing highly effective for demodex; safe across breeds including MDR1. Adult-onset generalised demodicosis warrants underlying disease workup — Cushing’s, hypothyroidism, neoplasia, immunosuppressive drugs. Sarcoptes is zoonotic — household humans develop transient itchy rash. Demodex is heritable — affected dogs should not be bred.
Frequently Asked Questions
What’s the difference between demodex and sarcoptes?
Critical clinical differentiation. DEMODEX (Demodex canis): commensal mite living in hair follicles of all dogs; OVERGROWTH in genetically predisposed young dogs (localised) or immunosuppressed adults (generalised). NOT CONTAGIOUS. Itching usually MINIMAL (‘demodex doesn’t itch’ is a clinical aphorism). Diagnosed by DEEP skin scrapings. SARCOPTES (Sarcoptes scabiei var canis): highly contagious mite; HIGHLY CONTAGIOUS to other dogs AND humans (zoonotic – transient itchy papular rash); SEVERE ITCHING – dog cannot stop scratching; classic distribution EAR MARGINS, ELBOWS, HOCKS, VENTRUM, eye rims; SUPERFICIAL scrapings often FALSE NEGATIVE – empirical treatment response often diagnostic.
What is the best treatment for dog mites?
ISOXAZOLINE CLASS (Bravecto fluralaner, NexGard afoxolaner, Simparica sarolaner, Credelio lotilaner) has REVOLUTIONISED canine mite treatment. SARCOPTES: single oral dose of Bravecto often curative; monthly NexGard/Simparica/Credelio effective. DEMODEX: monthly isoxazoline highly effective; older ivermectin/moxidectin/amitraz alternatives. SAFE across breeds – NO MDR1 contraindication (unlike high-dose ivermectin which is FATAL in MDR1 breeds). Off-label for mites in many markets but well-established evidence. Largely replacing older protocols.
Are dog mites contagious to humans?
Some yes, some no. SARCOPTES (sarcoptic mange / scabies) IS ZOONOTIC – humans develop itchy papular rash on arms, abdomen, thighs where contact occurred; resolves with treatment of the dog (mites don’t complete life cycle on human skin); symptomatic relief with topical steroid + oral antihistamine. CHEYLETIELLA (walking dandruff) also zoonotic – transient. DEMODEX is NOT contagious (commensal mite living in dog hair follicles – doesn’t transmit). OTODECTES (ear mites) – highly contagious between dogs and cats but rarely affects humans.
Why does my puppy have demodex?
LOCALISED DEMODICOSIS is common in puppies and adolescent dogs (less than 12 months). Mechanism: developing immune system + genetic predisposition allows commensal Demodex canis mite to overgrow. Presentation: few isolated patches on FACE, HEAD, FORELIMBS – often minimally itchy. About 50% SELF-RESOLVE within months without treatment as immune system matures. Conservative management: monthly monitoring + treat any secondary pyoderma. NOT contagious. AVOID corticosteroids (suppress immune response, worsen demodex). About 50% progress to generalised – then warrant active treatment with isoxazoline.
Why does my adult dog have generalised demodex?
ADULT-ONSET GENERALISED DEMODICOSIS (dog more than 4 years with new generalised demodex) ALMOST ALWAYS indicates underlying disease causing IMMUNOSUPPRESSION. Investigation essential: CUSHING’S DISEASE (most common – see PuppaDogs Cushing’s Calculator); HYPOTHYROIDISM; NEOPLASIA especially lymphoma; immunosuppressive medications (corticosteroids, chemotherapy, ciclosporin); severe metabolic disease. Full workup: senior bloodwork + ACTH stim/LDDS + abdominal ultrasound + medication review. Treat underlying disease alongside mite treatment – mite treatment alone less effective if immunosuppression continues.
What do ear mites look like in dogs?
OTODECTES CYNOTIS (ear mites) classic presentation: DARK WAXY ‘COFFEE GROUNDS’ DISCHARGE in ear canals + INTENSE HEAD SHAKING + EAR SCRATCHING. Sometimes visible moving mites in canal on otoscopic exam. Diagnosis: ear swab cytology shows mites under microscope. Most common in YOUNG DOGS and CATS – highly contagious between species. TREATMENT: clean ear canals + parasiticide (selamectin Stronghold/Revolution single topical dose; milbemycin oral; moxidectin Advantage Multi/Advocate topical; isoxazolines off-label) + monthly preventive going forward + treat all in-contact dogs and cats.
Related PuppaDogs Calculators
Continue building your dog’s personalised care plan with these related PuppaDogs calculators:
- Dog Pregnancy / Whelping Due-Date Calculator
- Puppy Weight Predictor (Adult Weight Calculator)
- Heatstroke Risk Calculator for Dogs
- Bloat (GDV) Risk Calculator for Dogs
- Dog Life Expectancy Calculator (Breed, Body Condition, Lifestyle)
- Spay/Neuter Timing Calculator for Dogs (Breed-Specific)
References & Further Reading
The dosing ranges and safety information on this page are drawn from the following veterinary references. Always defer to your own veterinarian and the manufacturer’s label for your specific product.
- Mueller RS. Treatment protocols for demodicosis – an evidence-based review. Veterinary Dermatology, 2004.
- Mueller RS, Bensignor E, Ferrer L, et al. Treatment of demodicosis in dogs: 2011 clinical practice guidelines. Veterinary Dermatology.
- Six R, Becskei C, Carter L, et al. Evaluation of the speed of kill, prevention of attachment and efficacy of sarolaner against Sarcoptes scabiei in dogs. Veterinary Parasitology, 2016.
- Beugnet F, Halos L, Larsen D, de Vos C. Efficacy of oral afoxolaner for the treatment of canine generalised demodicosis. Parasite.
- Curtis CF. Current trends in the treatment of Sarcoptes, Cheyletiella and Otodectes mite infestations in dogs and cats. Veterinary Dermatology.
- WSAVA Dermatology Group resources.
- PuppaDogs. Cushing’s Pre-Test Calculator and Itch Severity Index Calculator. puppadogs.com.
