They try to rescue the other dog, which was still breathing, by rushing it to a nearby vet’s, but it later had to be put down.
The dogs’ owner, security worker Richard Armstrong, 47, was convicted this week of causing unnecessary suffering to the two animals.
He claimed he had complaints from neighbours in nearby Plaistow about their barking so left them in the car instead of their kennel.
Security dogs Hector and Yardie, both Belgian Malinois, were left in the boot of the Vauxhall Astra estate vehicle for more than two hours on a hot day in April 2019 when temperatures reached 24C.
Passers-by saw the dogs in the back of the vehicle and called police.
They had been left in the back of the car with a fan running.
The RSPCA said the kennel in the boot was just large enough for one dog to stand, but without room to turn or move around.
There was no water in either kennel and Hector was found dead lying on his side with flies around his mouth amid a strong smell of urine and faeces, the RSPCA said.
Armstrong was convicted at Ilford Magistrates’ Court on Wednesday and was sentenced to a 12-month community order with 120 hours of unpaid work and ordered to pay costs of £750 and a victim surcharge of £90. The story continues...