EN
The occurrence of skin mites from the family Demodecidae was investigated in dogs in Poland, from the Gdańsk region. Samples of healthy skin from 39 dogs and samples of diseased skin from two dogs were examined. Three species of hair follicle mite were found, among them Demodex cornei and D. injai for the first time in Poland. D. canis and D. cornei were present on dog skin asymptomatically and usually synhospitalically - the former species on 42% and the latter on 7% of the skin samples. D. injai was found exclusively in correlation with the occurrence of symptoms of demodecosis in two mongrel dogs. The three species of hair follicle mite specific to dogs not only differed morphologically but were also found on different areas of the hosts' skin. The differentiation in structure, biology, and microhabitats of these mites may be associated with the occurrence of forms of demodecosis with different symptoms and courses in dogs.