Delta dog death
Delta dog death
PHOTO: WXYZ
Now playing
00:58
Owner: Blood was on my dog's blanket in cage
dog flown to japan
dog flown to japan
PHOTO: CNN
Now playing
01:32
Dog reunited with owners after Japan detour
SAN FRANCISCO, CA - JULY 08:  United Airlines planes sit on the tarmac at San Francisco International Airport on July 8, 2015 in San Francisco, California. Thousands of United Airlines passengers around the world were grounded Wednesday due to a computer glitch. An estimated 3,500 were affected.  (Photo by Justin Sullivan/Getty Images)
SAN FRANCISCO, CA - JULY 08: United Airlines planes sit on the tarmac at San Francisco International Airport on July 8, 2015 in San Francisco, California. Thousands of United Airlines passengers around the world were grounded Wednesday due to a computer glitch. An estimated 3,500 were affected. (Photo by Justin Sullivan/Getty Images)
PHOTO: Justin Sullivan/Getty Images/FILE
Now playing
00:38
Dog dies in overhead bin on United flight
WOOFF Act United dog death overhead bin newday_00000000.jpg
WOOFF Act United dog death overhead bin newday_00000000.jpg
PHOTO: CNN
Now playing
01:15
Senator wants bill banning pets in overhead bins
service dog kicked off flight
service dog kicked off flight
PHOTO: KTRK
Now playing
01:40
Vet kicked off flight for service dog
PHOTO: @mark_essig
Now playing
01:56
Duck causes a stir by flying on a commercial flight
Veteran
Veteran's service dog American Airlines dnt_00000409.jpg
PHOTO: KGTV
Now playing
01:56
War veteran's dog denied entry aboard flight
Family Kicked Off Allegiant Air Flight Allergic Reaction Dog pkg_00002919.jpg
Family Kicked Off Allegiant Air Flight Allergic Reaction Dog pkg_00002919.jpg
Now playing
01:14
Boy kicked off flight after allergic reaction
Pilot diverts airplane save dog pkg_00015316.jpg
Pilot diverts airplane save dog pkg_00015316.jpg
PHOTO: City News
Now playing
02:14
Pilot diverts airplane to save dog
newday berman blind man kicked off flight_00000416.jpg
newday berman blind man kicked off flight_00000416.jpg
Now playing
01:03
Blind man and guide dog kicked off plane
(CNN) —  

A dog being flown by Delta Air Lines from Phoenix to Newark, New Jersey, died during the trip Wednesday, according to a spokeswoman for the airline.

The owners, Michael Dellegrazie and his girlfriend, were traveling from Phoenix to New York and decided to put their 8-year-old Pomeranian, Alejandro, on a plane so they could pick the dog up at the Newark airport.

During the layover in Detroit, Alejandro was held in a cargo facility.

“There was a stop in Detroit at 6 a.m. Alejandro was checked on. He was alive. Then between 8 a.m. and 8:30 a.m. he was checked on again and he was dead,” said Dellegrazie’s attorney, Evan Oshan.

A Delta official said the dog was discovered with vomit and fluids in the cage.

“The family is very upset,” Oshan said. “This is essentially their family member who died. To say they are upset is a gross understatement.”

Delta released a statement saying it is “conducting a thorough review of the situation” and has been working with Alejandro’s owners to support them however possible.

“We know pets are an important member of the family and we are focused on the well-being of all animals we transport,” the statement said. “As part of that review, we want to find out more about why this may have occurred to ensure it doesn’t happen again.”

The airline also said it offered to have the dog’s body evaluated by a veterinarian.

Other airline-related dog incidents

Alejandro’s death comes after United Airlines had three animal-related incidents in the span of a week in March.

First, a French bulldog died on a Houston-to-New York flight after a United flight attendant told its owners to put the dog, in its carrier, in an overhead bin. United spokesman Jonathan Guerin said the passenger told the flight attendant there was a dog in the carrier, but the attendant “did not hear or understand her, and did not knowingly place the dog in the overhead bin.”

A day after that incident, a 10-year-old German shepherd named Irgo was flown to Japan when he was supposed to end up in Kansas. In Irgo’s place was a Great Dane that was supposed to be en route to Japan. The dog was reunited with his family two days later.

Later that week, a flight was diverted to Akron, Ohio, after the airline realized a pet was loaded onto the flight in error, airline spokeswoman Maggie Schmerin told CNN. The flight was going from Newark to St. Louis, but the pet was due to fly from New Jersey to Akron. United told CNN the unidentified animal was “safely delivered to its owner.”

CNN’s Kwegyirba Croffie contributed to this report.