ATTN. PIT BULL OWNERS: The Cinco de Mayo Festival loves all dog breeds but we have to abide by city rules. Please read the most current ordinance around Pit Bull breeds and necessary permits in Denver if you are thinking about bringing your Pit Bull breed along with you. The Cinco de Mayo Festival allows dogs but they must be on leashes and you must pick up after your dog. It is encouraged that you leave your dog at home due to the large crowds the event attracts but it is not enforced. The City and County of Denver will hold liable any owner of a pet who injures or causes death to another.