It's too hot to be transported.
The golden fur dog that was supposed to be on the plane was hot to death.

A pet committed to air transport was eventually found dead in the luggage hold of a long-distance car, and yesterday the fate of a golden fur dog drew attention. Ms. Chen paid for the high cost of transportation, transporting the dog through a “petty consignment company”, while the other party used clandestine land transportation. In the end, the golden fur dog died in the heat. Journalists have learned that deceiving customers to carry out land transport is common within the industry and can be described as one of the “catty” forms of pet transport.
Wing Lin, Ying Zi's evening newspaper/Violet Reporter Liu Xiao
What happened?
In the early hours of 9 July, Ms. Chen, a member of the Internet, wrote a letter accusing her pet dog, Kimsiri, of being killed in a shipment, which caused interest to her.
The journalists learned that the two parties had agreed that the dog would be flown by air at 9 p.m. on 7 July, while the shipping company had requested to pick up the dog in the morning of 6 July and had informed Ms. Chen of the grounds for obtaining a quarantine certificate. In fact, when the dog arrived in Nanjing, it was not certified as so-called, but was transported directly by road. On 7 July, Ms. Chen received information that the “flight” of the dog had been cancelled, while the shipping company explained that the dog was on a cargo plane that could take off normally. In the meantime, Ms. Chen made several telephone calls, which were not answered, and there was no video call from the pet dog. On the evening of 7 July, when Ms. Chen saw the dog, the dog had died, while the company was still arguing that it was caused by the heat in the air cargo compartment.

Journalist investigation.
A journalist survey found that a number of netizens have been shown to have been deceived in the purchase of pet transport services, using personal experience as a reminder not to easily trust the commitment of the pet car, shipping, etc. One netizens recalled that, when looking for a pet transport company to transport a pet, the originally committed $650 air-conditioning SUV was actually placed in the bus's baggage hold, which required $400.
According to sources in the transport industry, the use of “air transport” as a means of transporting pets by road is the industry's obnoxious “hard-hit” area, while the loading of long-distance bus baggage holds is in complete disregard of the pet's life.
Airlines, pet shipment is not complicated, but strictly required.
Tokyung, a staff member specializing in related business, indicated that passengers could apply for pets in advance on the airline network and that the process was not complicated. “One of the more important factors is temperature, which requires that the temperature at origin and destination should not be below minus 12 or above 30 degrees.” Journalists learned that the owner of a pet needs to provide a quarantine certificate from the pet hospital, as well as to purchase aeroplane boxes, arrive at the airport two hours in advance, and have a special packing net and plastic buttons on the airbox to ensure that it is not compromised.

“Airlines are now constantly optimizing the process of shipping pets, for example, by not loading pets into the cargo compartment too early, leaving the owners and pets to stay for a while before taking off. In addition, there are live animals in the holds who will notify the crew in advance of the temperature of the holds during the flight to ensure that the animal is less discomfort.”
Legalians, contractual fraud can claim triple compensation.
Subsequently, the transport company offered $6,000 for the value of the dog, which was rejected by the pet owner. In response, the Senior Partner of the Shanghai Co-operation (Nanjing) Law Office, Mr. Liu Ayatollah, indicated that the other party could be sued in court for additional compensation.
Journalists are aware that the law provides that the operator who fraudulently provides goods or services should, at the request of the consumer, be compensated for the loss incurred by him or her by three times the price paid by the consumer for the goods or the cost of receiving the services; and that the amount of compensation increased by less than $500 is $500. “The actual loss of the death of the dog can be claimed at the market price of the dog, plus the cost of transportation of $2,600, plus a sum of $2,600 three times the amount of compensation.”