To Shannon Locke, Poppy is far more than a pet dog.
The labrador pup warns the 23-year-old when she is about to have an epileptic seizure, meaning she is able to get herself to a safe place in good time.
Poppy then looks after Shannon during and after her seizure, by licking her owner's mouth to help her come round and remove excess saliva from Shannon's lips, which helps to prevent her from choking.
Shannon managed to catch Poppy's heroics on film during a recent seizure and the footage is truly amazing.
Shannon began to have potentially fatal seizures when she was 17 years old. At one stage her epilepsy was so bad that she couldn't leave her house because she was having around four or five seizures each day.
Today, Shannon has around two seizures per week and is given good warning that they are coming, thanks to Poppy.
"One day she just started to act strange, I'd no idea why. She just kept coming up to me and was panting," Shannon told Belfast Live.
"I didn't think much of it to begin with, but then I realised she was picking up that something wasn't right. Nobody knows how she spots it."
Poppy usually becomes agitated around 20 minutes before Shannon has a seizure and always makes sure her owner's airways are clear if Shannon is lying on her back.
Shannon said: "She's not only my best friend, she's a lifesaver. She has given me the confidence to get out and about and enjoy my life again."