The airline will honor existing reservations for dogs to travel as cargo.
It expects to complete its review by May 1, 2018.
"We are conducting a thorough and systematic review of our program for pets that travel in the cargo compartment to make improvements that will ensure the best possible experience for our customers and their pets", the airline said in a statement. "The suspension does not affect pets that travel with us in-cabin", United Airlines said. Two days later another flight made an unplanned landing in OH because it was carrying a dog that was put on the wrong plane.
Last year, United reported the deaths of 18 animals on its planes, far higher than other major airlines, according to the Department of Transportation.
Shortly after that episode, a flight from Newark to St. Louis was diverted to OH after it was discovered that a pet had been loaded on the flight by mistake.
One puppy died on a United Airlines flight after being forced into an overhead bin, and another was flown to Japan, but was supposed to go to Kansas, while the dog that was supposed to go to Japan ended up in Kansas.
The dog died before the Houston-to-New York City flight landed.
United, which took full responsibility for the death, claimed the flight attendant "did not hear or understand" the family's protests. "We are also reviewing this service and have already announced that beginning in April we will issue bright colored bag tags to help better identify pets who are traveling in-cabin", it said.