Demodicosis in Cats: A 2025 Veterinary Guide to Symptoms, Causes & Care 🐱🕷️

By Dr. Duncan Houston, BVSc

Demodicosis, also known as demodectic mange, is a skin condition in cats caused by an overgrowth of Demodex mites. While these mites are typically harmless residents of a cat's skin, certain conditions can lead to their proliferation, resulting in skin issues. Understanding the causes, symptoms, and treatment options is crucial for maintaining your cat's health.

Understanding Demodicosis 🧬

Demodicosis occurs when Demodex mites multiply excessively, leading to skin irritation and other dermatological problems. In cats, two primary species are responsible:

• Demodex cati: Resides in hair follicles and is often associated with underlying health issues.
• Demodex gatoi: Lives on the skin's surface and is contagious among cats.

While Demodex cati is typically found in immunocompromised cats, Demodex gatoi can affect healthy cats and is more prevalent in multi-cat households.

Causes and Risk Factors 🐾

Several factors can predispose cats to demodicosis:

• Immune Suppression: Conditions like Feline Immunodeficiency Virus (FIV), Feline Leukemia Virus (FeLV), diabetes, or cancer can weaken the immune system, allowing mite overgrowth.
• Genetic Predisposition: Certain breeds, such as Siamese and Burmese, may be more susceptible.
• Environmental Factors: Stress, poor nutrition, and overcrowded living conditions can contribute to the development of demodicosis.

Symptoms to Watch For 🔍

Clinical signs vary depending on the mite species involved:

Demodex cati:

• Hair loss, especially around the head, neck, and ears
• Redness and inflammation of the skin
• Crusting and scaling
• Ear infections with excessive wax buildup

Demodex gatoi:

• Intense itching and overgrooming
• Hair loss on the trunk and limbs
• Skin lesions and scabs
• Contagious to other cats, leading to outbreaks in multi-cat environments

Diagnosis 🩺

Diagnosing demodicosis involves:

• Skin Scraping: Collecting skin samples to identify mites under a microscope.
• Hair Pluck (Trichogram): Examining hair samples for the presence of mites.
• Acetate Tape Test: Pressing tape against the skin to collect surface mites.
• Skin Biopsy: In rare cases, a biopsy may be necessary for definitive diagnosis.

It's important to note that Demodex gatoi can be challenging to detect, and a negative test does not rule out its presence. In such cases, a trial treatment may be initiated to observe the response.

Treatment and Management 💊

Treatment strategies depend on the mite species and the severity of the infestation:

Medications:

• Lime Sulfur Dips: Weekly applications can be effective but may cause skin irritation and have a strong odor.
• Isoxazolines: Oral or topical medications like fluralaner (Bravecto®) and sarolaner (Revolution Plus®) have shown efficacy against Demodex mites.
• Ivermectin: An off-label oral medication used under veterinary supervision.

Addressing Underlying Conditions:

• Managing diseases like FIV, FeLV, or diabetes is crucial for successful treatment.
• Improving nutrition and reducing stress can bolster the immune system.

Environmental Management:

• For Demodex gatoi, treat all cats in the household to prevent reinfection.
• Maintain a clean environment by regularly washing bedding and disinfecting living areas.

Prognosis 📈

With appropriate treatment and management of underlying conditions, the prognosis for cats with demodicosis is generally good. However, recurrence is possible, especially if the underlying issues are not addressed.

Preventive Measures 🛡️

Preventing demodicosis involves:

• Regular veterinary check-ups to monitor overall health.
• Maintaining a balanced diet to support the immune system.
• Reducing stress through environmental enrichment and routine.
• Isolating new or symptomatic cats to prevent the spread of Demodex gatoi.

Living with a Cat with Demodicosis 🐱💖

Caring for a cat with demodicosis requires patience and diligence:

• Administer medications as prescribed and complete the full course of treatment.
• Monitor for signs of improvement or recurrence.
• Provide a comfortable and stress-free environment.
• Communicate regularly with your veterinarian to adjust treatment plans as needed.

Conclusion 📝

Demodicosis in cats, while uncommon, can cause significant discomfort and skin issues. Early recognition, accurate diagnosis, and comprehensive treatment are key to managing this condition effectively. Addressing underlying health problems and maintaining a healthy environment will support your cat's recovery and prevent future occurrences.

For personalized advice and support, consider reaching out to veterinary professionals through platforms like Ask A Vet. Their expertise can guide you through diagnosis, treatment options, and ongoing care tailored to your cat's specific needs.

Stay proactive in your cat's health to ensure a happy and healthy life together. 🐾