Can demodicosis spread to other pets or people?

Some forms can spread through close contact between dogs and cats, but most cases are linked to individual immune status. If you have multiple pets or a family member with immune concerns, ask your vet or doctor about preventive measures.

How long does treatment for demodicosis take?

Treatment duration depends on the severity of infection and the individual's immune response. Mild cases may show improvement within a few weeks, while severe or recurrent cases can require months of treatment with multiple negative scraping confirmations before discontinuing. Follow your vet's monitoring schedule.

What information or photos should I bring to the appointment?

It helps to bring a timeline of when symptoms began, close-up photos of the skin, videos of scratching behaviour, a list of current medications and supplements, and details about any contact with other animals so the vet can make an initial assessment.

If symptoms recur after treatment, what should I do next?

Recurrence warrants a return visit to investigate possible secondary infection or immune dysfunction. The vet may arrange more advanced testing or refer you to a dermatology specialist. Ask your vet for further diagnostic and treatment recommendations.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Demodicosis (Demodex Mange) in Dogs & Cats: Symptoms, Diagnosis & Treatment [2025]

Demodicosis is a skin condition caused by Demodex mites that leads to hair loss; oral antiparasitic treatment is highly effective, and juvenile-onset cases are often curable.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: WSAVA, ISFM, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate veterinary care (emergency)

•Large areas of skin are ulcerated and continuously draining a large amount of pus
•Persistent high fever with clearly reduced energy
•Breathing becomes rapid or signs of difficulty breathing appear

Schedule a clinic visit as soon as possible (within 24-72 hours)

•Large localized areas of hair loss with repeated scratching that injures the skin
•Hair becomes thin, scabs develop, or an unusual odor appears
•Appetite decreases or activity level is clearly reduced

01What symptoms indicate a problem?

Demodex infection commonly causes localised or widespread hair loss, skin redness, crusting, or intermittent itching. Severity varies; concurrent infection or systemic signs warrant prompt veterinary evaluation.

Patchy or widespread hair loss, commonly on the face, limbs, or one side of the body
Persistent or intermittent itching, with repeated scratching causing open sores
Thinning coat with dull hair; visible crusting or scaling on the skin
Redness, small nodules, or eczema-like skin changes
Symptoms lasting more than two weeks or progressively worsening should prompt a dermatology appointment

Seek emergency care immediately if you notice the following symptoms:

⚠️ Large areas of skin ulceration with continuous heavy discharge
⚠️ Persistent high fever accompanied by noticeably low energy
⚠️ Rapid breathing or signs of respiratory distress

02How should you assess the situation at home? Key observations and criteria for seeking emergency care

Observing and recording details at home before your visit can speed up diagnosis and provide the vet with key information.

Note the location and extent of hair loss and when it was first noticed
Take close-up photos of the affected skin and several short videos of scratching behaviour
Monitor whether appetite, sleep, and energy levels have changed
Check for discharge, crusting, redness, swelling, or unusual odour
Record any recent contact with other animals or changes in the environment
If possible, book an appointment at a clinic with dermatological examination capabilities as early as possible

03How does the vet make a diagnosis? Common examination procedures

Your vet will use multiple tests to confirm whether Demodex or another skin condition is responsible and to assess for secondary infection or systemic disease.

Physical examination

assessing the extent of skin involvement and overall health status

Skin scraping

microscopic examination to identify Demodex mites or other parasites

Skin biopsy

histopathology when necessary to rule out other underlying causes

Blood and biochemistry panels

to exclude internal disease or assess immune status

Serology or bacterial culture

to check for concurrent infection or systemic involvement

04How to treat and care for your pet after diagnosis? Medications, dietary adjustments, and home care guide

Treatment typically involves medication and home care, with regular re-examinations to confirm clinical improvement and complete parasite clearance.

Topical or oral medications selected based on test results; treatment courses may last weeks to months
Regular follow-up visits to monitor skin improvement and repeat skin scraping
Keep skin clean at home, avoid moisture, and prevent scratching-induced secondary infections
Adjust diet and nutrition to support skin health and immune recovery
A follow-up skin scraping is recommended before ending treatment to confirm parasite clearance
Recurrent cases or treatment failure should be referred to a veterinary dermatology specialist

05What should you prepare before seeing the vet? Key information to help your vet identify the cause quickly

Bring a written record of when symptoms started and how they have progressed

Prepare recent close-up photos of the skin and several scratching videos for the vet's reference

List all current medications, topical treatments, and supplements

Record diet, bathroom habits, and any contact with other animals

If prior examination reports or prescriptions exist, bring or have digital copies ready

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.