A man's neopolitan mastiff dog died in an United Airlines flight from Miami to San Francisco becoming the second pet in the same number of months, to perish in a flight from the airline.

Michael Jarboe, the owner, is reportedly "furious" at the airline. He said the dog was in perfect health and complains that the airline had promised an air conditioned facility for his dog when he purchased the pet's ticket, but the crew left him in a very hot place, according to WSVN.

The Miami flight to San Francisco this summer, made a stop in Houston. Just before taking off, in Houston, Jarboe looked out his window and saw his nearly 3-year-old dog Bam Bam visibly hot on a luggage carrier that was not an air conditioned van.

"It was right under the wing. We were right there, had a direct shot, he was so hot. His tongue was hanging down," said Jarboe, according to WSVN. "Never, ever, have I ever seen him that hot. What United promised us is an air conditioned cargo facility and an air conditioned cargo van."

After the plane landed in SF he received the tragic news.

"The guy came out, a bunch of them and said, 'I'm sorry he didn't make it,' and it's so surreal. What do you mean? We just put him on, we put him on ... He was fine."

Jarboe says that he had made the same trip with the dog in the past about four times.

United Airlines reportedly paid for a necropsy and determined the death cause was a heart attack and not the airline's fault.

Jarboe, who paid $650 for the transport of Bam Bam, received a refund but declined compensation.

A statement from the airline said:

"Given the size of Bam Bam and the fact that he is a brachycephalic, meaning short nosed breed, we made the decision to bring him to our holding facility for greater comfort during his connection. Our holding facilities are USDA animal welfare-approved and provide ample room and air ventilation in addition to regular monitoring and watering provided by trained pet safe personnel. We have refunded the full transport fare for the dog and are working with Mr. Jarboe on additional compensation."

Jarboe is urging UA to be more clear to its customers about the conditions the animals are traveling in.

This is the second tragic death of a pet aboard a United Airlines flight.

Supermodel Maggie Rizer lost her two-year-old golden retriever to the negligence of the airline in a flight from Newark to San Francisco.

WSVN-TV -