The temperament of a dog is defined as a dog's innate tendency to respond to a given stimulus in a particular way. It looks for signs of shyness and fear. In this study, we used the ATT (American Temperament Test), which is a temperament test prescribed for dogs. The purpose of the ATT is to warn dog owners about any issues that may be resolved with training. This study was conducted on 62 dogs of various breeds, including 16 Cane Corso from the working group, 14 German Shepherds from the herding group, and 32 Griffons from the toy group. A statistical analysis of the current study, including descriptive analyses, Cronbach's alpha to evaluate the extracted factor's internal reliability, and dimension reduction, was computed to evaluate the factor's internal validity. Interestingly, results show that the Griffons from the toy group had a significantly higher passing rate than the other two breed groups. This is due to the fact that there is a difference in temperament among breed groups, as the Griffon's temperament from the toy group is intelligent, alert, sensitive, full of self-importance, and curious. In contrast, the Cane Corso's temperament from the working group is protective of property and owners, easily trained, docile, and affectionate with family, and the German Shepherd's temperament from the herding group is fearless, confident, aloof with strangers, and quietly stands ground.