How to Cite: Sultan, S. R., & Al-Mola, E. D. H. (2022). Diagnosis and distribution of Giardia parasites in dogs in Mosul city, Iraq. International Journal of Health Sciences, 6(S3), 8277–8288. https://doi.org/10.53730/ijhs.v6nS3.7816 International Journal of Health Sciences ISSN 2550-6978 E-ISSN 2550-696X © 2022. Manuscript submitted: 27 March 2022, Manuscript revised: 9 April 2022, Accepted for publication: 18 May 2022 8277 Diagnosis and distribution of Giardia parasites in dogs in Mosul city, Iraq Saif Rafea Sultan Department of Internal and Preventative Medicine, College of Veterinary Medicine, University of Mosul, Mosul, Iraq Eman Daham Hadi Al-Mola Department of Internal and Preventative Medicine, College of Veterinary Medicine, University of Mosul, Mosul, Iraq Abstract---The current study aimed at diagnosing the Giardia parasite that parasitizes dogs, based on a number of morphological and standard characteristics of the trophozoites and the cycts, using different techniques for microscopic examination. The results of the current study showed that the total percentage in dogs amounted to 73.4%. With regard to the rate of infection with Giardia parasite using different techniques of positive samples for microscopic examination, the results showed significant differences. Whereas, the concentration-deposition and flotation technique with zinc sulfate recorded the highest infection rate of 44.5%, followed by the flotation technique–Sodium chloride and flotation technique - Sucrose at 25% and 19.4%, respectively. And the zinc sulfate technique by adding Lugol′s iodine recorded the highest infection rate of 43.8%, and the direct technique by adding Lugol′s iodine recorded the highest infection rate of 50%. The results showed that the intestinal mucosal scrapings stained with Giemsa stain recorded the highest infection rate for diagnosing Giardia parasite, with a value of 100%. The results showed that there were no significant differences between the age group of less than one year–More than a year. The male infection rate was 65.3%. And the rate of infection with Giardia cysts in dogs whose stools are of solid consistency recorded the highest rate of 68.1%, depending on the number of cysts presented (more than 10 cysts of Giardia means infection). With regard to the months of the year, the results showed an increase in the incidence of infection in the month of October, reaching 31.9%. The average length of the trophozoites was 1.05 .±13.3 and width 0.31±6.1 The average length of the cysts was 0.49±9.9 and width 0.33±5.9. There was no significant difference in the incidence of infection in the areas of both sides of Mosul city. Keywords---diagnosis, distribution, Giardia parasites, dogs.