The U.S. Department of Transportation on Wednesday proposed that only specially trained dogs qualify as service animals, which must be allowed in the cabin at no charge.
![New rules could bump emotional-support animals from planes](https://media.zenfs.com/en/ap.org/7e305dbcff97de7fa8466662272a81d9)
Airlines could ban emotional-support animals including untrained dogs, cats and more exotic companions such as pigs, pheasants, rabbits and snakes.
Airlines say the number of support animals has grown dramatically in recent years.