The purpose of den trials is to assess innate ability and preparedness of dachshunds and terriers to work in natural beds in order to control fox numbers. International earthdog trials within the period 2009–2018 were evaluated in Slovakia, in which 1812 dogs participated, of which terriers represented 61.36% and dachshunds 38.64%. Depending on the way of work, dogs of these breeds work as bayer, bolter or hard dog. The test rules were compared in terms of animal protection, principles of ethics (...) and welfare requirements in the Visegrad countries. We investigated the extent to which animals used in trials are exposed to suffering in the countries under review. During the den trials in Slovakia, there is a direct physical contact between the dog and the fox, where the foxes are unnecessarily exposed to excessive stress, injury and pain and violated by Five Animal Welfare Needs, in particular the need to protect against pain, injury and disease. Due to non-compliance with the welfare, we propose a change in the examination rules in the earthdog work in Slovakia. Non-parametric Chi square statistic to analyse group differences when the dependent variable is measured at nominal level was used. (shrink)