The banned breeds (and breed mixes) were  pit bull terriers, American Staffordshire terriers, preso canario, perro de presa Canario, dogo Argentino, cane Corso, fila Brasileiro, Tosa (or Tosa Ken) and ca de bou. The effort to lift the ...

perro de presa canario; presa canario; tosa. Now, I've got to admit, despite being a dog lover for my entire life, I have never heard of the seven listed at the end.  A quick google search provided me images of what looked to be our mastiff or bull mastiff. 

perro de presa canario, presa canario and tosa (or tosa ken). The policy prompted an online petition at Change.org that received nearly 46,000 signatures. In response, United changed its policy, effective April 24. It no longer bans the nine breeds but ...

The nine restricted breeds were: American pit bull terrier, American Staffordshire terrier, ca de bou, cane corso, dogo Argentino, fila Brasileiro, perro de presa canario, presa canario, and tosa (or tosa ken).

The breeds currently listed under the Department of Veterinary Services’ (DVS) restricted list for imported dogs are Bull Mastiff, Bull Terrier, Doberman, German Shepard/Alsatian, Perro de Presa Canario (also known as Canary Dog) and Rottweiler.