"A service animal is a dog or miniature horse that is basic obedience trained, potty trained, and task trained for someone's disability", said Amanda Pratt, the owner and a trainer at Scout's Legacy Service Dogs.
WestJet also requires documentation similar to what American Airlines requires, and the paperwork needs to be dated no more than a year before planned travel.
Neither will support dogs that growl at, jump on or try to bite other fliers.
When we've come to a place where airlines have to deny emotional support peacocks entry to a flight, it's possible we've come entirely too far.
"American, like other airlines, has experienced an increase in customers who are transporting a service or support animal onboard our aircraft-more than 40 percent from 2016 to 2017", it said in a statement.
Under American's new guidelines, insects, hedgehogs and goats join a list of restricted animals that includes amphibians, ferrets, reptiles, rodents, snakes, spiders, sugar gliders, non-household birds, animals with tusks, horns or hooves, and animals that are unclean or have an odor.
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The country's largest airline, which has a major hub in Miami, released its new policy Monday detailing stricter rules for flying with a furry emotional support companion.
Upon toughening its requirements in March, Delta reported an 84 percent hike in animal incidents since 2016, including the mauling of a passenger by a 50-pound dog on a flight from Atlanta to San Diego past year.
A number of groups were consulted by American for its new policy, including the American Association of People with Disabilities, Paralyzed Veterans of America, the American Council for the Blind and My Blind Spot. Richard Burr, R-N.C., introduced legislation to protect the ability of people with disabilities - including veterans - to travel with trained service animals.
Delta and United also tightened their rules on animal support animals this year after seeing an increase in animals accompanying passengers.
American will also train its employees on how better to distinguish a support animal from a pet.
Under the legislation, people who have mental disabilities who need to travel with emotional support or "psychiatric service" animals may still be able to fly with their animals.