London: Dogs can be life-savers by acting as an early-warning system for millions of patients with diabetes, a new study has found.Experts have proved for the first time that dogs trained to respond to their owner`s low blood sugar levels can save them from a potentially fatal - hypoglycaemic attack.The animals use their acute sense of smell to detect changes in the chemical comp-osition of their owner`s sweat or breath.They can be taught to raise the alarm by barking, pawing or even fetching a blood testing kit.
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