A pig should fly in a padded crate, in a dark compartment. In unfamiliar surroundings, a pig gets scared, and starts running up and down. He also questioned pig sanitation at 33,000 feet. If the pig moved its bowels, passengers would bail out in parachutes. The pig, according to the airline's report, fouled the jetway after disembarking at the Seattle airport.
Pigs live and eat close to the ground.