The aim of this study was to determine tile inhibitory effect of granitic powder against Microsporum canis. Fourteen strains of M. canis isolated from dgs and cats with fungal dermatitis and two strains isolated from humans were used in this study. The in vitro antifungal activities of granitic powder and 5 commercialized antifungal agents (terbinafine, itraconazole, ketoconazole, griseofulvin and fluconazole) were compared. The antifungal effect was measured by the broth microdilution method and was expressed as the minimal inhibitory concentration (MIC). The MIC value of the granitic powder was ranged from 31.3 to 250mg/ml. Terbinafine showed the lowest MIC value among the 5 commercial antifungal agents $(0.0078-0.125{mu}g/ml)$, while fluconazole showed the highest MIC values $(125-1,000{mu}g/ml)$. The MIC range of itraconazole, griseofuvin and ketoconazole were $0.125-0.5{mu}g/ml;0.625-5{mu}g/ml$ and $10-40{mu}g/ml$ respectively. The Geometric mean(GM) MIC values of terbinafine and ketoconazole against M. canis isolated from human were $0.0078{mu}g/ml;and;10{mu}g/ml$, respectively, while the GM MIC values of these agents against M. canis isolated from animals were $0.063{mu}g/ml;and;31.4{mu}g/ml$, respectively. Other antifungal agents did not show any significant differences in antifungal activity against M. canis of animal or human origin. Although granitic powder was shown to have antifungal activity, it was much lower than that of the 5 commercialized antifungal agents.