Police are hunting a gang who killed a dog by hurling it from a moving truck travelling at 60mph.
Chris Hallam, 18, was left traumatised after he witnessed the lurcher being thrown from the oncoming vehicle as he drove along the A52 on Wednesday.
Hallam said he was travelling along the dual carriageway at around 2.45pm when he saw something "flying through the air."
The McDonald's worker jumped out of his vehicle and ran towards the severely injured dog as it lay in a pool of blood by the roadside.
He put the dog, called Ice, into the boot of his car and rushed it to a vet in Nottingham - but the one-year-old animal's injuries were so severe he had to be put down.
Hallam said: "It was just the most horrific thing I have ever seen, the poor thing didn't stand a chance.
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"I was driving along the road when I noticed something flying through the air as I passed an old farmer-type pick-up truck coming in the opposite direction.
"I pulled into a lay-by and ran over to help and two other guys who also stopped said they had seen a commotion in the back seat just as it happened.
"So we're pretty sure it was deliberately thrown. I just don't understand how anyone could want to do that to a dog.
"The noise coming from him was heartbreaking, he was in so much pain so I took him to the RSPCA at first.
"But they said they couldn't do anything so I took him to a vets and they came out to my car and sedated him and put him on a stretcher.
"I went to work and my mum phoned me later on to say it hadn't survived. He had suffered broken bones in his pelvis and internal injuries which they couldn't operate on.
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"I was devastated because if he had lived we were going to provide him with his forever home.
"We know his name was Ice from the microchip but the dodgy thing was when the vets called up the name on the chip, they just said 'oh I've sold that dog'.
"I'm convinced this was done on purpose. If it was an accident you would know something had happened and you would stop.
"You wouldn't drive off and leave him lying there on the side of the road to die."
A spokeswoman from the vets added: "He was just so terrified and in a lot of pain. We had to sedate him while in the back of the car before we could take him out to examine him, which is when the scans showed the problems of the internal injuries."
Nottinghamshire Police have launched an investigation and have appealed for any witnesses or those with information to get in touch.
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