D ogs hold a special position in most human societies, not equaled by any other animal species. The extraordinary intelligence of dogs has been exploited by human beings for conducting various activities, including hunting, retrieving, herding, rescue operations, tracking and security. Zinc is one of the most significant trace elements found in living creatures, and it plays a role in a variety of biological processes, including carbohydrate, lipid, protein and nucleic acid metabolism (Al-Saad et al., 2010). It has a role in keratinization regulation, optimal reproductive function, wound healing, immune system function and maintenance normal sense of smell and taste (Miao et al., 2013).Zinc is required for growth, cell formation, proliferation and differentiation (Underwood and Suttle, 1999). Zinc is a component of more than 70 metalloenzymes and found in muscle, bone, teeth, reproductive organs, liver, spleen and hair. It is a component of thymosin, a thymic hormone involved in the immunological response, and serves as a cofactor in cellular protein synthesis (Willense, 1995).Skin stores about 2% of the total amount of Zn in the body, with the epidermis containing six times more zinc than the dermis. Zinc levels are higher in tissues with high epithelial proliferation rates, as well as normally parakeratotic sites like the nose and keratinized pressure areas like the footpads (Colombini, 1999).Zinc deficiency can be caused by a lack of Zn in the diet or by genetic defects (Machado et al., 2011). It develops from eating diets that are low in Zn "primary deficiency" or diets high in phytates, which block Zn absorption, or high in minerals like calcium (which chelates Zn in the