Demodecosis spread in dogs and its clinical manifestation

The aim of the research is to study the spread of demodectic invasion in dogs and its clinical manifestation in the Tyumen Region. The studies were carried out at the departments of non-infectious diseases of farm animals and infectious and invasive diseases, in the laboratory of acarology of the All-Russian Research Institute of Veterinary Entomology and Arachnology - a branch of the Tyumen Research Center of the SB RAS, as well as in veterinary clinics of the Tyumen Region. 3546 dogs with lesions of the skin and hair, different in sex, breed and age, in the period were clinically examined 2006–2020 with the obligatory confirmation of the diagnosis of canine demodicosis using microscopy of skin scrapings and the detection of demodectic mites. As a result of the studies conducted, it was found that the infestation of dogs by ticks with demodexes is recorded everywhere. To assess the extensibility of dogs by demodectic invasion, laboratory studies of skin scrapings from the sites of parasitism of Demodex canis ticks, from the head, trunk, extremities, lower abdomen, etc. were carried out. The most frequently recorded invasion of animals was noted in July – 17.24 % and August – 21.3 %; the smallest number of sick animals was noted in December – 0.33 %. At the same time, demodectic invasion was manifested in dogs in four forms: in scaly – 36.3 % of cases; pustular – 18.8; papular – 2.8 and mixed – 42.2 %. Depending on the intensity of skin lesions, it was determined that the prevailing positions are occupied by generalized demodicosis – 61.1 %, and less often localized demodicosis – 38.9 %. The incidence of dogs with demodicosis in the Tyumen Region is recorded on average at 18.44±1.12 %.