Objective To ascertain the prevalence of gastrointestinal parasites in stray and pet dogs in the Beijing-Tianjin region. Methods Fresh fecal samples were randomly collected from pet dogs and stray dogs in the Beijing-Tianjin region from June 2016 to July 2017.Eggs in fecal samples were concentrated by aldehyde-ether precipitation and examined under a microscope. Results The overall prevalence of a parasite was 52.99%,the prevalence of a parasite in stray dogs was 79.68%,and the prevalence of a parasite in p...