British Formula One star Lewis Hamilton is heartbroken after being unable to revive his pet dog, Coco as she died in his arms.

In a lengthy Instagram post, he wrote to his 16.8 million followers: "Last night at around 9pm, my beautiful little girl Coco died at home with the family by her side. Her little heart gave in. We think it was a heart attack. I tried to revive her but it was of no use. She’d had the best day, happier than I’d seen her in a long time. She was such a special dog, born with so many problems and I feel so lucky to have adopted her.