Dog in carry-on bag at airport
Credit: Sandy Huffaker/Getty Images

United Airlines announced on Tuesday that it will resume transporting pets in cargo storage this summer. However, there are 44 breeds of dogs and four breeds of cats that will not be allowed underneath the aircraft.

In an effort to make its pet travel safer, United will no longer accept short or snub-nosed dogs and cats and strong-jawed dogs in the cargo hold. The breeds include pugs, bulldogs and several types of spaniels.

The airline will also stop transporting pets to and from Las Vegas, Palm Springs, Phoenix and Tucson airports from May 1 through September 30 due to dangerous high summer temperatures.

In March, the airline paused its pet cargo transfer program after three dogs were loaded onto the wrong aircraft and a fourth died in an overhead bin.

Last year, the Department of Transportation reported that 1.3 animals out of every 10,000 transported in United cargo died. That number is significantly higher than the industry-wide average of 0.47 out of every 10,000.

United announced that it will partner with American Humane on its PetSafe transport program.

“As we continue our review process to ensure that we are always doing what's right, we are committed to making significant improvements in our program and adhering to the best practices of animal comfort, well-being and travel on behalf of our customers and their pets,” Jan Krems, United’s vice president of cargo, said in a statement.

In addition to banning select breeds, the airline will now also require the presence of a more senior employee when pets are being loaded into cargo, according to the Chicago Tribune.

Beginning July 9, passengers will be able to check approved breeds into the cargo on their flight (reservations open June 18). On July 30, United will allow pets to travel alone in cargo.

The Humane Society recommends that pet owners “choose the cabin when possible” if flying with a pet because of health risks. “Excessively hot and cold temperatures, poor ventilation and rough handling” are the cause of pet deaths in the cargo hold every year.