"This was a tragic accident that should never have occurred, as pets should never be placed in the overhead bin", Maggie Schmerin, a spokeswoman for the airline, said in a statement.
"They assured the safety of the family's pet so wearily, the mother agreed", Lara wrote.
"Pets should never be placed in the overhead bin", the airline said in reply Tuesday to CNN's request for comment about reports of the dog's death.
"She realized the dog was dead right there and she just started crying", she said.
A fellow passenger on the flight, June Lara, posted to Facebook: "There was no sound as we landed and opened his kennel". "I held her baby as the mother attempted to resuscitate their 10 month old puppy".
"Tonight I was on a plane where I witnessed a @united flight attendant instruct a passenger to place her dog carrier (with dog) in the overhead compartment". I cried with them three minutes later as she sobbed over his lifeless body.
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After the flight, the woman was horrified to find the dog, which was reportedly not checked on during the flight, had died.
'The flight attendants of flight UA1284 felt that the innocent animal was better off crammed inside the overhead container without air and water, ' he wrote on Facebook.
The dog's owners were a woman, her teenage daughter and an infant who were traveling from Texas to LaGuardia Airport, Gremminger told Buzzfeed.
United have offered to pay for a necropsy of the small dog and issue a full refund on flight tickets. "We are thoroughly investigating what occurred to prevent this from ever happening again", United said in a statement.
Last year, 18 animals died while being transported on United - there were six cases on all other US carriers combined, according to the Department of Transportation. The kennel must fit completely under the seat in front of the customer and remain there at all times. In April, a giant rabbit named Simon died on a United flight last April en route to the Iowa State Fair.
In 2017, United had the highest number of animal deaths of any US carriers, according to a Department of Transportation (DOT) report, with 18 animals killed and 13 injured in transport.