Felix Conde, a resident of  Aventura, Florida in the county of Miami-Dade, has filed a lawsuit to challenge Miami-Dade County’s 24-year-old pit bull ban.   Passed in 1989, Miami-Dade’s breed-specific legislation (BSL) prohibits so-called pit bulls within the county, no exceptions, not even for service dogs.   Mr. Conde suffers from a breathing ailment that…