Are there size, breed, or “pawlicy” limits on flights?

Airlines often restrict brachycephalic (snub-nosed) breeds, aggressive breeds, or pets over a certain size/weight. 

• Breed bans: Pit bulls, bulldogs, Pekingese, and Persian cats are sometimes not allowed (especially in cargo).
• Size limits: If a pet/carrier is too large, cargo transport may be needed.
• Documentation: Airlines and some destinations require up-to-date breed/cross-breed info.