Intestinal parasitism presents potential health risks to canine hosts, and environmental contamination from infected dogs, often subclinical, can put other dogs, other animals, and humans at risk of disease.While stray and shelter dogs are at greatest risk of parasitic infection, reports from several European countries indicate that intestinal parasitic infections are common in domestic dogs.Ancylostoma caninum, Trichuris vulpis, and Toxocara canis have been the most commonly identified nematode species in dogs, and infections with Giardia intestinalis, Cystoisospora spp.and tapeworms are common.Therefore, understanding the risk of canine intestinal parasite infection, diagnosing the infection, and effective control measures are important considerations from a One Health perspective.In this context, a group of researchers has carried out a study with the aim of estimating the prevalence of canine intestinal parasitism by collecting fecal samples in Western European cities.To carry out the research, fresh fecal samples were collected from 2,469 dogs that visited 164 parks in 33 cities in 12 countries, including Spain.Each owner responded to a questionnaire focused on their dog's signaling and recent history of anthelminthic treatment.Collected samples were examined for hookworms, whipworms, roundworms, and Giardia using a coproantigen diagnostic immunoassay and microscopic examination.After knowing the results, nematodes or Giardia were detected in at least a sample of 100% of the cities and in 93.3% of the parks.Likewise.nematodes were found in 57% of the parks.Overall, 22.8% of dogs tested positive for an intestinal parasite, with Giardia being the most commonly identified parasite (17.3% of dogs, 83.5% of parks).For nematode infection, 7.6% of all dogs tested positive, with 9.9% of dogs under 1 year of age infected, 7.7% of those 1 to 3 years of age, 7.3 % of those between 4 and 6 years old and 6.6% of those over 7 years old.In Spain, 93% of the parks studied were positive for Giardia.Among the nematodes detected, ascarids were the most prevalent (3.6% of dogs and 28.7% of parks), being more frequent in dogs less than 1 year old, but also present in older dogs, including those older than 7 years.Hookworms and whipworms were detected in 3.2% and 2.3% of dogs of all ages, respectively, and in 37.2% and 17.7% of parks, respectively.In relation to the countries, roundworms were detected in samples from 70% of the parks in the Netherlands and from approximately 30% to 40% of the parks in Austria, Germany, Ireland, Italy, Spain and Sweden.Regarding the antiparasitic treatment carried out, in general, 77.2% of the owners reported having carried out previous anthelmintic treatment, of which at least 62.7% did not follow the recommended treatment frequency.Dogs that received anthelmintics in the previous month had a lower percentage of nematode infection than those in which less than 1 month had passed since the previous dose.Given the prevalence estimates of intestinal parasite infections in dogs reported in the article published in Springer Nature, the authors highlight “the need to educate owners about guidelines for regular parasite testing and treatment, even in older dogs, as failure to follow the guidelines "may result in continued transmission of these infections, including those with zoonotic potential."