Signs of Mites and Lice in Dogs: What to Look For

Name: Signs of Mites and Lice in Dogs: What to Look For
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-02

Mites and lice are two different parasites that both cause intense itching, scratching, and skin or coat changes in dogs. The most common signs of dog mites include hair loss, redness, crusty skin, and scratching that gets worse over time, while lice usually show up as tiny moving insects and glued-on eggs in the coat. This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

Mites are microscopic and burrow into or live on the skin, so you often cannot see them, while lice are small insects you may spot by parting the hair [1][2].
Ear mites cause head shaking, ear scratching, and dark crumbly debris that looks like coffee grounds.
Lice look like tiny pale insects and their eggs (nits) are glued to hair shafts, so ordinary shampooing will not wash them off [3].
Both problems need a veterinarian to confirm, because allergies, infections, and other skin diseases look almost identical.
Most cases are treatable, but untreated infestations can spread to other pets and cause severe skin damage.

What Are Mites and Lice in Dogs?

Mites and lice are external parasites, meaning they live on the outside of your dog's body. They are not the same organism and they do not behave the same way.

Mites are tiny arachnids, relatives of spiders and ticks. Most are microscopic, so you will not see them crawling on your dog. Mange is the general term for skin disease caused by mites that invade the skin of otherwise healthy animals, and the mites trigger irritation, itching, hair loss, and inflammation [1]. Several types affect dogs, including sarcoptic mange (canine scabies), ear mites (otodectic mange), walking dandruff (cheyletiellosis), and trombiculosis [1].

Lice are small, flightless insects that live in the hair of animals. Dogs can carry one species of bloodsucking louse and two species of chewing lice [2]. Chewing lice feed mostly on skin debris and secretions, while bloodsucking lice feed on blood [3]. Lice are usually host specific, meaning dog lice do not readily transfer to people or cats [3].

If you are also worried about internal parasites, our guide to the signs of worms in a dog covers what to watch for.

Signs of Dog Mites: What Owners Notice First

Mite problems rarely look the same in every dog, but the pattern is usually itching plus visible skin change. The signs of dog mites depend on which mite is involved and where it lives on the body.

General skin signs

Persistent scratching, rubbing, biting, or licking at one area or all over
Redness and inflammation of the skin
Hair loss, often in patches
Crusts, scales, or thickened, darkened skin
A rough, matted, or dull coat [2]
Restlessness and trouble settling, especially at night

Signs of dog ear mites

Ear mites live in the ear canal and are one of the most common causes of sudden ear discomfort in dogs. Owners typically notice:

Head shaking and repeated scratching at one or both ears
A dark, crumbly discharge that looks like coffee grounds
Redness or swelling inside the ear flap
A sour or musty odor if a secondary infection develops

Ear mites are easy to confuse with a bacterial or yeast ear infection, and the two often occur together. Our article on dog ear infection or ear mites walks through how vets tell them apart.

Signs of sarcoptic mange (canine scabies)

Sarcoptic mange is caused by Sarcoptes scabiei var canis, a highly contagious mite found on dogs worldwide [1]. These mites burrow tunnels in the skin to lay eggs, and the entire life cycle takes 17 to 21 days on the infested dog [1]. The incubation period ranges from 10 days to 8 weeks, depending on how heavily the dog is infested, which body areas are affected, how many mites were transmitted, and the dog's overall health and hygiene [1].

Signs include intense itching, especially on the ears, elbows, and belly, plus red bumps, crusts, and hair loss. Because these mites can also affect people who come into contact with an infected dog, family members may develop an itchy rash too [1].

Signs of demodicosis (Demodex mange)

Demodex mites are common on mammalian skin, but they can overgrow and cause disease under certain conditions [4]. In one study of street dogs with skin symptoms, demodicosis was confirmed in 21% of cases, and every affected dog had alopecia, most often on the legs [5]. Young puppies were the most affected group at 37.5% of cases [5].

Demodicosis often starts as patchy hair loss around the face, eyes, or paws. Localized cases can be mild, but generalized demodicosis causes widespread hair loss, redness, scaling, and secondary bacterial infections.

Signs of walking dandruff and trombiculosis

Walking dandruff (cheyletiellosis) causes heavy scaling, especially along the back, and the mites may appear as moving dandruff. Trombiculosis, caused by harvest mites, produces intense itching and small orange or red bumps, usually on the feet, belly, and face. In rare cases, trombiculiasis has been linked to acute neurologic signs in dogs, so sudden neurologic changes in a dog with known mite exposure deserve urgent veterinary attention [6].

What Do Dog Mites Look Like?

Most dog mites are too small to see without a microscope. Sarcoptes mites burrow into the skin, and Demodex mites live deep in hair follicles, so you will not spot them by looking at your dog's coat [1][5].

What you can see are the changes they cause: redness, scabs, dandruff, and bald patches. If you want a visual reference for the different mite types and how they appear under magnification, see our mites on dogs skin guide.

Signs of Dog Lice: What to Look For

Lice are larger than mites and can sometimes be seen with the naked eye. You often need to part the hair to find them, and infestations can go unnoticed in long-haired breeds [2].

Look for:

Tiny, pale, wingless insects moving slowly through the coat
Nits (eggs) glued to hair shafts near the skin
A rough, matted coat with patchy hair loss [2]
Scratching, rubbing, and biting at the affected area [2]
Restlessness and irritability

Nits are pale, translucent, and almost oval, and ordinary shampooing and washing will not dislodge them [3]. Immature lice look like smaller versions of adults, and it takes about 3 to 4 weeks for most lice to go from egg to a reproductively capable adult, though this varies by species [3].

Lice infestations tend to be heaviest in very young and very old dogs, and they are more common in debilitated or stray animals [2]. They are rare in dogs receiving monthly flea and tick preventatives [2].

Mites vs. Lice vs. Other Skin Problems

Feature	Mites	Lice	Allergies or infections
Visible to the eye	Usually no	Often yes, with close inspection	No
Itching	Often severe	Moderate to severe	Variable, often seasonal
Hair loss pattern	Patchy, face, legs, ears	Patchy, rough coat	Widespread or localized
What you see	Redness, crusts, scales	Insects and nits on hairs	Redness, bumps, odor, discharge
Contagious to other pets	Often yes	Yes	Usually no
Response to shampoo alone	No	No, nits stay glued [3]	Sometimes

This table is a rough guide only. Many skin diseases overlap, and a veterinarian needs to examine your dog to know what is actually going on.

Causes and Risk Factors

Mites spread mainly through direct contact between animals. Sarcoptic mange is easily spread by contact, and indirect transmission through infested bedding is less common but possible [1]. Because these mites can affect people and other animals that come into contact with an infected dog, prompt treatment protects your whole household [1].

Demodex mites are different. They normally live on skin as commensals, and disease happens when they overproduce, often in young dogs or dogs with weakened immune systems [5][4]. One study found demodicosis most often affected puppies, females, mixed breeds, and dogs with above-ideal body condition, though no single factor was statistically significant on its own [5].

Lice spread through direct contact and shared bedding or grooming tools. Risk is higher in crowded conditions, shelters, and among very young, very old, or debilitated dogs [2].

How Veterinarians Diagnose Mites and Lice

Diagnosis starts with a full skin and ear exam. Your vet will ask when the itching started, which areas are affected, whether other pets or people are itchy, and what preventatives your dog receives.

For mites, the vet usually performs skin scrapings. In one study, samples were treated with 10% KOH and examined under a microscope to confirm Demodex mites [5]. Because sarcoptic mites burrow and can be hard to find, a negative scraping does not always rule out mange, and vets sometimes treat based on signs alone.

For lice, diagnosis is often simpler. Parting the hair to look for lice and nits is frequently enough to confirm the infestation [2].

Ear mites are usually diagnosed by examining ear debris under a microscope. Your vet will also check for bacterial or yeast infections, which commonly occur alongside mites.

Treatment Options

Treatment depends on which parasite is present, how severe the infestation is, and your dog's age and health.

For lice, pyrethrins can be used in dogs, and fipronil and selamectin are common spot-on treatments for both dogs and cats [2]. Your veterinarian will calculate the correct dose based on your dog's weight and health status. Never guess at a dose or use a product labeled for another species.

For mites, treatment may include topical medications, medicated baths, spot-on products, or oral drugs. Ear mites need the ear canal cleaned and treated, and any secondary infection addressed at the same time. Sarcoptic mange treatment must include every dog in the household, plus washing bedding and cleaning the environment.

Demodicosis treatment can take weeks to months, and generalized cases often need repeated checkups and skin scrapings to confirm the mites are gone. Some dogs need treatment for underlying conditions that allowed the mites to overgrow in the first place.

Never use an over-the-counter product on a dog without confirming the diagnosis first. Some products are toxic to certain species, and using the wrong one can make your dog sick.

Recovery, Outlook, and Long-Term Management

Most dogs recover well with proper treatment. Lice are generally easier to clear than mites because the parasites stay on the hair and are more accessible to medication [2].

Sarcoptic mange usually improves quickly once treatment starts, though the full course must be completed. Demodicosis can be stubborn, especially the generalized form, and relapses happen. Regular follow-up visits and repeat skin scrapings help confirm the mites are gone before treatment stops.

If your dog has an underlying allergy or immune problem, managing that condition is part of long-term control. Dogs with atopic dermatitis, for example, often have ongoing skin inflammation that makes them more prone to secondary skin problems. Keeping up with flea, tick, and parasite prevention also lowers the risk of lice and some mite infestations [2].

Prevention

Keep your dog on a veterinarian-recommended monthly parasite preventative. Lice infestations are rare in dogs receiving monthly flea and tick preventatives [2].
Avoid contact with dogs that have visible skin problems, hair loss, or heavy scratching.
Do not share bedding, brushes, or grooming tools between dogs, especially in multi-dog homes or shelter settings.
Wash bedding and vacuum areas where an infested dog has spent time.
Check new dogs, especially puppies and seniors, for lice and nits before introducing them to other pets [2].
Treat all pets in the household at the same time when mites or lice are confirmed.

If you are managing multiple parasites at once, our articles on signs my dog has worms and what are the signs and symptoms of a dog with worms can help you keep track of what to watch for.

Limitations and When to Contact a Veterinarian

This article cannot tell you what is causing your dog's symptoms. Only a veterinarian who examines your dog can diagnose mites, lice, or another skin condition and prescribe the right treatment.

Contact your veterinarian the same day if you notice:

Sudden, severe itching that keeps your dog awake
Rapidly spreading hair loss
Red, raw, or bleeding skin from scratching
A bad smell or pus from the ears or skin
Other pets or people in the home developing itchy skin

Seek emergency care right away if your dog has:

Sudden neurologic signs such as wobbling, head tilt, or seizures, especially after known mite exposure [6]
Extreme lethargy, weakness, or collapse
Signs of a severe allergic reaction such as facial swelling or trouble breathing

Schedule a routine visit if you see mild scratching, occasional head shaking, or small bald patches that are not getting worse. Early treatment is easier and less expensive than waiting for an infestation to spread.

Frequently Asked Questions

Can I see mites on my dog?

Usually no. Most dog mites are microscopic and live in the skin or hair follicles, so they are not visible to the naked eye [1][5]. What you can see are the skin changes they cause, such as redness, crusts, and hair loss.

Are dog lice contagious to humans?

No. Lice are typically species specific, meaning dog lice do not readily transfer to people [3]. They do spread easily between dogs, so other pets in the home usually need treatment too.

How do I tell the difference between mites and lice?

Lice are small insects you may spot by parting the hair, and their eggs are glued to hair shafts [3][2]. Mites are microscopic, so diagnosis usually requires skin scrapings or ear swab exams [1][5].

Do I need to treat my other pets if one dog has mites?

Yes, in most cases. Sarcoptic mange is highly contagious and spreads easily between animals by contact, so all pets in the home should be evaluated and treated together [1]. Your veterinarian will advise which pets need treatment.

Can my dog get mites or lice again after treatment?

Yes. Reinfestation is possible if your dog contacts an infested animal or contaminated environment. Keeping up with monthly parasite prevention and checking new dogs before they join the household lowers the risk [2].

References

Mite Infestation (Mange, Acariasis, Scabies) in Dogs - Dog Owners. Merck Veterinary Manual.
Lice in Dogs and Cats - Integumentary System. Merck Veterinary Manual.
Lice of Dogs - Dog Owners. Merck Veterinary Manual.
First Detection of Human- and Dog-Associated Demodex Mites (Acari, Arachnida) in Southern European Wolves (Canis lupus). Pathogens (Basel, Switzerland), 2026.
Canine Demodicosis in Rupandehi Nepal's Street Dogs: Prevalence, Clinical Signs, and Hematology. Veterinary sciences, 2025.
Trombiculiasis in 4 Dogs with Neurologic Signs, the Netherlands, 2024. Emerging infectious diseases, 2025.