The fighting bull breed is characterized by a genetic selection based on a certain behavior called "bravery". Making use of the etiological assessment computer software designed by the Department of Animal Production of the University of León, the behavior of 2577 animals aged from 3 to 6 years has been recorded. These animals have been grappled since 1991 to 2016 in different Spanish bullrings of 1st and 2nd category, in order to study the evolution of the selection carried out in the breed during the last 25 years and the influence on the behavior of the improvements implemented in the management of this type of livestock. Interesting results can be obtained that reflect the change in the selection of the fighting bull towards a nobler bull and "tolerable", corresponding to the information that gives us the starting point behavior of the animal and during the third of rods. In turn, there is an increase in physical activity developed by the animal, which leads to longer crutches, with more batches, probably due to improvements in feeding and the implementation of a physical training protocol in most of the farms.