Virtually all horses in Poland receive periodically deworming treatment. In the view of emerging anthelmintic resistance it is important to know the current parasite control practices used by Polish horse owners. In order to assess the situation and analyze it in terms of the risk of drug resistance, a questionnaire survey was forwarded to 300 horse establishments. The response rate was 49.6%. The average number of deworming treatments in adult horses was determined at 2.1. and 2.8 for youngstock per calendar year. The most commonly used drugs were ivermectin, pyrantel pamoate and moxidectin. Almost 73% of respondents indicated that they take into consideration the resistance of parasites. However, only 4,03% of the responders regularly send faecal samples from all horses for parasitological examination. In ca. 92% of cases the person administrating the drug guessed the weight of the horse by the visual evaluation. Generally, little attention was payed to pasture hygiene and prevention of parasitic infection. The responses indicate high level of awareness among horse owners of the need to control parasites. It also show the large involvement of veterinarians as a source of advice about deworming practices, so we concluded that the most appropriate way to achieve improvement would be implementation of further education programmes for veterinarians.