Why have so many dogs leapt to their deaths from Overtoun Bridge?

For Donna Cooper, the worst thing about watching her collie dog, Ben, leap to his death has been the effect it has had on her two-year-old son Callum. 'Nearly a year on, Callum still asks about Ben. He was very upset by the dog's death and wants to know if his leg has been fixed in heaven,' she says.

Just 12 months previously, Donna, her husband and son were walking their dog across the picturesque Overtoun Bridge in Milton, near Dumbarton, Scotland. Without warning, Ben leapt over a parapet on the century-old granite bridge and fell 50ft to his death on the rocks below.

'His paw was broken, his jaw was broken and his back was broken and badly twisted. The vet decided it wasn't worth putting him through the pain, so we had to let him go,' recalls Donna.

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