Therapeutic management of generalized canine Demodicosis with Simparica® (Sarolaner): A case report
Abstract
A young male dog was presented to the Teaching Veterinary Clinical Complex, DSVCKV, Anjora, Durg, with a history of progressive hair loss, erythema, scaling, crusting and itching for approximately one month. Dermatological examination revealed multifocal to generalized alopecia, erythematous skin lesions, follicular casts, crusts and mild secondary pyoderma, mainly involving the periocular region, muzzle, forelimbs, ventral abdomen and trunk. Deep skin scrapings were collected from multiple active lesions and examined microscopically after processing with liquid paraffin. Numerous cigar-shaped mites consistent with Demodex canis were observed, confirming generalized canine demodicosis. Haematological examination revealed mild anaemia and neutrophilic leukocytosis, suggestive of chronic inflammatory dermatitis with secondary bacterial involvement. The dog was treated with oral Simparica® containing sarolaner as the primary acaricidal therapy, along with systemic antibiotic support, antihistaminic medication, medicated bathing and nutritional supplementation. Marked reduction in pruritus and erythema was observed by day 14, while hair regrowth and clinical improvement were evident by day 28. Repeat deep skin scraping on day 56 was negative for live mites. The present case highlights the importance of early diagnosis by deep skin scraping and integrated therapeutic management for successful recovery in generalized canine demodicosis.
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Introduction
Canine demodicosis is a common parasitic skin disease of dogs caused by excessive proliferation of Demodex mites, most commonly Demodex canis. These mites normally inhabit hair follicles and sebaceous glands in small numbers, but clinical disease occurs when mite multiplication increases due to immature immunity, genetic predisposition, malnutrition, stress or underlying immunosuppression. The disease may occur in localized or generalized form. Localized demodicosis is usually mild and may resolve spontaneously, especially in young animals. Generalized demodicosis is more severe and is characterized by widespread alopecia, erythema, scaling, crusting, follicular plugging, secondary bacterial infection and sometimes systemic illness. Adultonset generalized demodicosis may be associated with underlying systemic diseases such as endocrinopathies, neoplasia or long-term corticosteroid administration. Diagnosis is confirmed by demonstration of mites or their developmental stages in deep skin scrapings, hair pluck examination or skin biopsy in difficult cases. The present case report describes the diagnosis and therapeutic management of generalized demodicosis in a dog.
Case History
A young male dog, approximately eight months old and weighing 16 kg, was presented to the Teaching Veterinary Clinical Complex, DSVCKV, Anjora, Durg, with a history of progressive hair loss, redness of skin, scaling, crusting and itching for the past one month. The owner reported that the lesions initially appeared around the eyes and muzzle and gradually extended to the forelimbs, ventral abdomen and trunk. The dog had reduced appetite and dullness for the past few days. No previous complete acaricidal treatment had been given.
Clinical Examination
On general clinical examination, the dog was dull but responsive. Rectal temperature was 102.5 °F, heart rate was 104 beats/minute and respiratory rate was 34 breaths/minute. Mucous membranes were pale pink. Dermatological examination revealed multifocal to generalized alopecia, erythema, scaling, crusting, follicular casts and comedones. Lesions were more prominent around the periocular region, muzzle, forelimbs, ventral abdomen and trunk. Mild pustules and epidermal collarettes suggested secondary bacterial pyoderma.
Diagnostic Examination
Deep skin scrapings were collected from five active lesion sites, including periocular region, muzzle, forelimb, abdomen and trunk. The affected skin was squeezed gently to extrude follicular mites, and scraping was continued until mild capillary oozing was observed. Samples were placed on glass slides with liquid paraffin and examined under lowpower microscopy. Microscopic examination revealed numerous elongated, cigar-shaped mites with short legs, morphologically consistent with Demodex canis. Adult mites, immature stages and eggs were observed, confirming active demodectic infestation. Skin cytology from pustular lesions revealed neutrophils and cocci, indicating secondary bacterial pyoderma.
Haematological examination showed mild anaemia and neutrophilic leukocytosis.
Treatment
The dog was treated with oral Simparica® chewable tablet containing sarolaner at the recommended therapeutic dose according to body weight as the primary acaricidal therapy.
The owner was advised to administer the drug once monthly and to return for regular clinical and parasitological followup.
For secondary bacterial pyoderma, amoxicillin-clavulanate was administered at 12.5 mg/kg body weight orally twice daily for 14 days. Chlorpheniramine maleate was given as antihistaminic support for pruritus. Medicated bathing with chlorhexidine and benzoyl peroxide shampoo was advised twice weekly to reduce bacterial load, remove follicular debris and improve skin hygiene. Supportive treatment included omega fatty acid supplementation, multivitamin-mineral preparation and nutritional correction. The owner was advised to avoid corticosteroids, maintain regular bathing, improve diet and return for follow-up examination at 14, 28 and 56 days.
Follow-up and Results
By day 14, pruritus and erythema were markedly reduced.
Crusting and scaling had decreased, and the dog showed improvement in appetite and activity. By day 28, visible hair regrowth was observed in periocular and abdominal regions. Pustules and epidermal collarettes had resolved. Repeat deep skin scraping on day 28 showed marked reduction in mite count. On day 56, deep skin scrapings from multiple sites were negative for live mites. The skin showed good hair regrowth and clinical recovery. No adverse effects were observed during the treatment period.
Conclusion
The present case confirms that generalized canine demodicosis should be suspected in dogs showing progressive alopecia, erythema, scaling, crusting and follicular casts, especially when lesions involve the face, limbs and trunk. Deep skin scraping is an effective diagnostic method for confirmation. Oral Simparica® containing sarolaner, along with systemic antibiotic therapy, medicated bathing and supportive care, resulted in successful clinical and parasitological recovery. Regular follow-up and repeat skin scraping are essential to prevent relapse and ensure complete cure.
Acknowledgement
AcknowledgementThe authors are thankful to the Teaching Veterinary Clinical Complex, College of Veterinary Science and Animal Husbandry, DSVCKV, Anjora, Durg, Chhattisgarh, for providing clinical facilities.
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