After a retrospective study of the chronologic series from 1987 to 1993, 707 clinical records were evaluated, concerning to 10 per cent of the dogs attended in a Veterinary Hospital located in the area of the Metropolitan Region of Belo Horizonte, Brazil. Variables such as age and sex were analyzed and a populational pyramid for the species was elaborated. In the demographic structure, it was observed a major concentration of young aninmals; 70.29 per cent of the dogs were aged below 49 months. The canine populational pyramid showed a wide form in the base, represented by young animals, and a marked decrease of the other categories, being similar to that observed in other countries