The changes come after a Delta passenger was mauled by an emotional support dog on a flight last year.

>>Delta passenger bitten by emotional support dog couldn’t escape, says attorney

Delta said it carries 700 service or support animals a day. Since 2016, the airline said it saw an 84 percent increase in reported incidents involving service and support animals, including urination or defecation and biting.

"Customers have attempted to fly with comfort turkeys, gliding possums, snakes, spiders and more," Delta said. "Ignoring the true intent of existing rules governing the transport of service and support animals can be a disservice to customers who have real and documented needs."