Mange in Dogs: Causes, Symptoms, and How Vets Help

Mange in dogs is a skin disease caused by microscopic mites that burrow into or live within the skin and hair follicles, leading to hair loss, itching, scabs, and inflammation.

The two most common forms, sarcoptic and demodectic mange, look similar at first glance but differ in how they spread and how they’re managed.

At Round Rock Animal Hospital, our veterinary team diagnoses and treats both types in dogs throughout Round Rock and Williamson County—from young puppies with localized bald spots to newly adopted rescue dogs coming in off rural Texas roads.

Below is an overview of what causes canine mange, how to recognize the symptoms early, whether your family or other pets are at risk, and the modern, gentle treatments available today.

What Causes Mange in Dogs?

Every case of mange traces back to mites, but the specific species involved determines how the condition behaves. Veterinarians generally group mange in dogs into two main categories.

1. Sarcoptic Mange (Canine Scabies)

Sarcoptic mange is caused by Sarcoptes scabiei, an oval-shaped, microscopic mite that burrows into the outer layer of the skin to mate and deposit eggs.

This burrowing triggers an intense allergic reaction, causing pruritus (itching) so severe that dogs will scratch, bite, and chew themselves raw. Sarcoptic mites are highly contagious and pass rapidly via direct physical contact, shared bedding, grooming clippers, and boarding facilities.

In Central Texas, wildlife such as coyotes, foxes, and raccoons frequently act as carriers. Dogs that explore local greenbelts, rural ranches, or brushy hiking trails face higher exposure risks.

2. Demodectic Mange (Demodex / “Red Mange”)

Demodectic mange is caused by Demodex canis, a cigar-shaped mite that naturally resides inside the hair follicles and sebaceous glands of nearly all healthy dogs.

Mothers pass these microscopic mites to their puppies during nursing within the first few days of life. Under normal circumstances, a healthy canine immune system keeps the mite population small and harmless. Trouble arises when an underlying immune deficiency or physical stress allows the mites to proliferate uncontrollably.

Unlike scabies, demodectic mange is not contagious to other healthy adult dogs or people.

Sarcoptic vs. Demodectic Mange: Key Differences

Feature	Sarcoptic Mange (Scabies)	Demodectic Mange (Demodex)
Causative Mite	Sarcoptes scabiei	Demodex canis
Contagious to Other Dogs?	Yes, highly contagious	No, non-contagious
Contagious to Humans?	Yes (temporary itchy rash)	No
Primary Symptom	Intense, agonizing itching and self-trauma	Patchy hair loss; mild itching unless infected
Common Initial Locations	Ear margins, elbows, hocks, belly	Around the eyes, muzzle, mouth, and front paws
Wildlife Reservoir	Coyotes, foxes, stray canines	None (naturally occurs on domestic dogs)

Risk Factors That Encourage Mite Overgrowth

Certain circumstances make mites more likely to take hold, including:

Immature Immune Systems: Puppies under 18 months whose immune defenses are still developing.
Underlying Endocrine Disorders: Unmanaged hypothyroidism or Cushing’s disease in adult and senior dogs.
Immunosuppressive Medications: Long-term steroid therapy (such as prednisone).
Malnutrition & High Stress: Crowded kennel environments, neglect, or shelter living.
Breed Predisposition: Bulldogs, Pit Bull Terriers, Boxers, Boston Terriers, and Shar-Peis have higher genetic rates of generalized demodicosis.

What Does Mange Look Like on a Dog?

Symptoms vary depending on the mite involved, how long the infestation has gone on, and your dog’s overall health. Some dogs show only a few thinning spots, while others develop dramatic skin changes over large areas of the body.

Warning Signs of Sarcoptic Mange

Inappeasable Itching: Scratching, licking, and chewing with little to no relief from standard flea baths or allergy antihistamines.
Crusty Ear Flaps & Elbows: Yellowish, scabby crusts along the ear edges, hocks, and underside of the chest.
Secondary Skin Trauma: Open sores, weeping abrasions, and hyperpigmentation (thickened, blackened “elephant skin”) caused by chronic scratching.
Systemic Stress: Poor sleep, sudden weight loss, and behavioral irritability due to ongoing physical distress.

Warning Signs of Demodectic Mange

Localized Form: One to five distinct, circular, scaly bald patches with mild redness—most frequently encircling the eyes (“spectacle alopecia”) or corners of the mouth.
Generalized Form: Extensive, widespread hair loss spanning large portions of the trunk, neck, and legs.
Pododemodicosis: Swollen, painful, oozing paws with persistent deep bacterial infections that make walking uncomfortable.
Secondary Malodor: A distinct musty, oily odor resulting from secondary bacterial or yeast overgrowth in damaged follicles.

Because allergies, ringworm, flea infestations, and hormone disorders can produce similar symptoms, a professional exam is the only reliable way to confirm mange in dogs.

Is Mange in Dogs Contagious to People or Other Pets?

Whether mange spreads depends entirely on the type, which is one reason an accurate diagnosis matters so much for your household.

Sarcoptic Mange Spreads Easily

Sarcoptic mange is highly contagious between dogs and can pass to cats on occasion. It’s also considered zoonotic, meaning people can catch it too. Humans who handle an infected dog may develop itchy red bumps, usually on the arms, waist, or chest. Because these mites can’t complete their life cycle on human skin, the rash typically resolves once the dog receives treatment, though anyone with symptoms should check with their own physician.

If your veterinarian diagnoses sarcoptic mange, they’ll likely recommend treating every dog in the home, even those without symptoms, along with washing bedding and cleaning shared spaces according to their guidance.

Demodectic Mange Stays Put

Demodectic mange in dogs is not contagious to people, cats, or healthy adult dogs. The mites already live on most dogs, and the disease only develops when an individual dog’s immune system allows them to overpopulate. That’s why veterinarians often look for an underlying health issue when an adult dog develops demodicosis for the first time.

Protecting Your Household

Until a diagnosis is confirmed, it’s wise to limit close contact between an itchy dog and other pets and to avoid dog parks, daycare, and grooming appointments. Your veterinarian can tell you when it’s safe to resume normal routines. Recent adoptees and rescued strays deserve an early checkup too, since shelters and outdoor living can increase the chance of bringing mange in dogs home without realizing it.

How Do Veterinarians Diagnose and Treat Mange?

Confirming mange starts with a thorough physical exam, a review of your dog’s history, and a few quick, minimally invasive tests performed right in the clinic.

Clinical Diagnostics

Superficial & Deep Skin Scrapings: A dull scalpel blade is used to gently scrape skin layers onto a microscope slide. Demodex mites are easily visualized, whereas sarcoptic mites burrow deep and can be elusive.
Trichogram (Hair Plucking): Hair roots are inspected under magnification for mite eggs and larvae clinging to follicle bases.
Diagnostic Treatment Trials: If clinical signs strongly indicate scabies but mites hide during microscopic review, your veterinarian may initiate treatment immediately; a rapid positive response confirms the diagnosis.

Veterinary Treatment Options

Modern treatments for mange in dogs are far more effective and convenient than older approaches. Depending on the type and severity, your veterinarian may prescribe oral or topical parasite medications, medicated baths, and antibiotics or antifungals to clear secondary infections. Dogs with demodicosis may also need care for any underlying condition weakening their immune system. Follow-up skin scrapings help confirm that mites are gone before treatment ends.

Avoid home remedies like motor oil, bleach, or essential oils, which can burn or poison your dog without killing the mites. Over-the-counter products may delay effective care and allow the infestation to spread.

Skin and Coat Care at Round Rock Animal Hospital

Mange in dogs can look alarming, but it’s a treatable condition, and most dogs make a full recovery with the right plan. Early diagnosis shortens recovery time, eases your dog’s discomfort, and lowers the chance of mites spreading to other pets or family members. Whether you’ve noticed a single bald spot on your puppy’s face or your dog can’t stop scratching, a veterinary exam is the best first step.

Our team at Round Rock Animal Hospital provides compassionate dermatology care for dogs throughout Round Rock and nearby communities. If your dog shows signs of hair loss, crusting, or constant itching, call us at (512) 255-6232 to schedule an appointment. We’ll identify the cause and help your dog get back to healthy, comfortable skin.