Dogs are being trained in Britain as potential life-savers to warn diabetic owners when their blood sugar levels fall to dangerously low levels.

Man's best friend already has been shown capable of sniffing out certain cancer cells, and dogs have long been put to work in the hunt for illegal drugs and explosives.

Their new front-line role in diabetes care follows recent evidence suggesting a dog's hyper-sensitive nose can detect tiny changes that occur when a person is about to have a hypoglycemic attack.

At the Cancer and Bio-Detection Dogs research centre in Aylesbury, southern England, animal trainers are putting that finding into practice and honing dogs' innate skills.

The charity has 17 rescue dogs at various stages of training that will be paired up with diabetic owners, many of them children.

"Dogs have been trained to detect certain odours down to parts per trillion, so we are talking tiny, tiny amounts. Their world is really very different to ours,"