(WILX) — There are new rules for emotional support animals at United Airlines.

Starting Monday, United Airlines will only allow dogs and cats to fly with passengers as emotional support animals.

The new rule also bans all support animals from flights longer than eight hours, although service animals with specialized training can still travel on long haul flights.

All dogs and cats traveling on board flights must be at least four months old.

Additionally, only dogs, cats and miniature horses will be allowed to fly as service animals.

Although the changes take effect Monday, United says it will honor reservations made by January 3rd under the old rules.