UNITED Airlines is caught in yet another controversy surrounding the death of an animal.

The airline, which has the worst record for pet deaths on-board their flights, is being held responsible by a Houston family for the death of their 5-year-old King Charles spaniel.

The Rasmussen family has claimed that United Airlines is responsible for the passing of their dog.

In a report to an ABC affiliate, the family said their dog was in the cargo hold of the plane when the flight was delayed and held on the tarmac for two hours before taking off to San Francisco, reports the New York Post.

During that time in the cargo hold, the family says their dog died.

In a statement released to Fox News, United said:

“We are so sorry to learn of Lulu’s passing and have reached out to our customer to offer our condolences and assistance. We are deeply upset any time an animal suffers an injury while travelling with us and especially grieved in the rare instance that one passes away. We are conducting a thorough review of this incident.”

This is just the most recent accusation of animal deaths and cruelty that the airline has faced.

This article was first published in the New York Post.