The evaluation of Trichuris vulpis infection of unwanted dogs in Kraków area. The aim of this work was the estimation of the infection with Trichuris vulpis of dogs in Cracow's Shelter for Stray Animals. A coprologic examination carried out between January and November 1999-2000 showed the prevalence of infection from 6.8% to 15.1 % and EPG from 88 to 913.