EN
The aim of the study was to investigate the prevalence of endoparasite infections in dogs taken care of in clinics in Olsztyn. Determining the prevalence of infections was based on faecal examination using standard coprological methods. Only nematode eggs were found. Of 157 faecal samples, 27% were positive. Among females, 40% of samples were positive, whereas among males -14%. All infected animals were over 18 months old. The most prevalent nematodes were Ancylostoma caninum (18%) and Toxocara canis (7%). In dogs dewormed during the year preceeding investigation, the prevalence of infection was 7%, while in unwormed ones – 33%.