United Airlines is partnering with the Humane Society to “improve the well-being of all pets that travel on United.” New rules and regulations will be put in place starting in June. Right now, only cats and dogs on the approved breed list will be allowed to board flights.

The rules also state that animals must use approved crates, and specialized drop-offs and pickups will be put in place in airports. Flyers are also asked to bring all required documents for their pets upon departure.

United has posted a list of breeds not allowed to fly due to increased health risks in the air on their website.