They can tell when you have low blood sugar
Some trained dogs seem to detect low blood sugar levels. According to a 2000 article in the British Medical Journal, more than one-third of dogs living with diabetic people have been reported to display behavioral changes when their owners’ blood sugar drops, sometimes even before patients themselves were aware of it. In two case studies cited by the paper, the dogs not only detected their owners’ falling glucose levels, they even nudged their owners into eating.
It’s unclear how the dogs did it, but it’s possible that they detected minute muscle tremors, or changes in the owners’ scents, according to the study.
And they might be able to learn the skill. Reportedly, Cavalier King Charles Spaniel was recently taught to recognize low blood sugar by the Pups in Prison program at the Junee Correctional Centre in Australia, where inmates helped train service dogs