Therapeutic Management of Chronic Generalized Demodicosis in a Pug

Neeraj Arora^2*, Sukhdeep Vohra¹, Satyavir Singh¹, Sandeep Potliya², Anshul Lather³, Akhil Gupta³, Devan Arora⁴, Davinder Singh⁴

*Corresponding author:[email protected]

ARTICLE CITATION: Arora N, Vohra S, Singh S, Potliya S, Lather A, Gupta A,Arora D and Davinder Singh D (2013). Therapeutic management of chronic generalized demodicosis in a pug. Adv. Anim. Vet. Sci. 1 (2S): 26 – 28.
Received: 2013–11–07, Revised: 2013–12–30, Accepted: 2013–12–30
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ABSTRACT

A two year old female pug was presented to Teaching Veterinary Clinical Complex, LLRUVAS, Hisar with the history of itching, alopecia, crust formation, haemorrhage and thickening of the skin on face, neck, trunk and abdomen since last two months. The condition was laboratory diagnosed as chronic demodicosis and treated with amitraz and ivermectin along with supportive therapy. The female pug responded well to the treatment and recovered completely on 28th day after the start of the treatment.

Animal skin is exposed to attack by many kinds of parasites and each species has a particular effect on the skin; thatcan be mild or severe. In this regard, most of the ectoparasitic infestations produce irritation and sensitization of the skin. The reaction of the skin to these ectoparasites living in or on the skin results in inflammation, edema and an attempt to localize the foreign body, toxin or excretory products of the parasite. These reactions are often allergic and cause itching and burning sensation (Scott et al., 2001). Canine demodicosis, also called demodectic mange or follicular mange or red mange, is a common skin disease encountered in veterinary practice. Though the mite is a normal inhabitant of the hair follicles of all canines, clinical signs of demodecosis are common because of excessive proliferation of mite within the hair follicles (Scott et al. 2001). Canine demodicosis is most commonly caused by Demodex> canis; however, other species, such as, Demodex injai (a large bodied mite) and Demodex cornei (a short bodied mite), may also be involved (Tater and Patterson, 2008). Various drugs have been used against the Demodex mites with mixed results (Mueller, 2004). However, in view of increase in amitraz–resistant generalized demodicosis cases (Živičnjak, 2005) the current communication shows the therapeutic management of a generalized demodicosis in a pug with a combination therapy of acaricides and macrocyclic lactones along with adjunctive treatment.

A two year old female pug weighing 8 Kg was presented to Teaching Veterinary Clinical Complex, Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, Haryana with history of inappetance, hair shedding, foul smell from body and pruritis since 2 months. On clinical examination of the dog alopecia, crust formation, erythema and lichenification of skin was observed in the region of face, neck, trunk and limbs (Figure 1).

Deep skin scrapings from the skin of affected areas taken with proper sample collection technique were examined microscopically. The skin scrapings didn’t show any evidence of mite infestation, however, faecal sample examination showed the presence of elongate, cigar shaped mite with body divisible into head, thorax bearing four pairs of short and stumpy legs and abdomen bearing transverse striations. The morphology confirmed it to be Demodex canis (Soulsby, 1982) (Figure 2). Complete blood count, liver function test and mineral profile were also performed (Hb, TLCand DLC were performed as per standard procedures while iron, copper, ALT and AST were estimated by biochemical autoanalyser using Erba kits.) Skin scrapings /cm² area were also collected before start of treatment and on subsequent days post–treatment (Singh and Chhabra, 1992) and the mite count/cm2 area was also correlated with improvement of lesions.

Amitraz (Diponil®) 12.5% was diluted @ 4 ml (500 mg)/L of water (at 500 ppm or 0.05% concentration) and carefully worked into the skin with a sponge after every week for twenty–one days. Before dipping, bathing with benzoyl peroxide shampoo was done for soothing of skin and removal of crusts and debris. Ivermectin (Tab. Neomec®) was given @ of 600µg/ kg body weight at weekly interval for three weeks. Oral cephalexin tablets (250mg) were also given daily for 15 days to check any secondary bacterial infections. Fatty acids supplement and liver tonic was also given along with adequate nutrition during the treatment period. New hair growth on affected skin started after 7th day of start of treatment (Figure 3) and complete uneventful recovery occurred on 28th day after start of the treatment (Figure 4).

In present communication Demodex canis was not found in direct skin scrapping on day 0, which might be due to wrinkling as well as thickening and extensive involvement of skin of the animal. Pug licks the skin due to severe pruritis, as a result Demodex canis was found in faecal examination. So it is suggested that faecal examination of the animals suspected for demodicosis or with chronic form of mange must be done. Results of complete blood count, liver function test and mineral profile showed anaemia, leukocytosis due to neutrophilia, increase in values of aspartate aminotransferase and alanine aminotransferase, decrease in serum iron and increase in serum copper (Table 1). Similar findings were also reported by Jyotsna et al. (2005) reported decrease in serum iron and cobalt level and increase in serum copper but no change in serum zinc level in demodectic mange in dogs.

The detail of skin scraping along with mite count and improvement in skin lesions is given in Table 2. It was observed in the present study that although no mite was found in skin scraping on day 0 due to thickening, wrinkling and extensive involvement of skin, the active mites (67/cm²) along with eggs were found on day 3 when the softening of skin and breakage of thick crust started. From the improvement of lesions on skin and reduction of mites in scrapings, the animal started appearing healthy after second treatment. At this point most of animal owners or the veterinarian stops the acaricide treatment of the animal but some mites at the extremities i.e. inter–digital area still remains alive and proliferate with the appearance of favourable conditions (specially post–rainy season with the start of winters). After third treatment the animal was parasitologically free of any adult mite or its developmental stages and skin growth at all the body parts also started. To rule out any mite present on body fourth treatment was also given on 21^th day. Complete hair growth along with smooth and shiny skin was observed on 28^th day.

So it is suggested to field veterinarians that although the animal appears normal clinically after second treatment, atleast three to four dips in amitraz is recommended by parasitologist for complete recovery of animal and to prevent the occurrence of demdecosis.

ACKNOWLEDGEMENT

The authors are highly thankful to internee students for taking interest in care and management of this pug.

CONFLICT OF INTEREST

No conflict of interest to declare.

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