Both Catherine Pipon and her pooch Molly suffer from "heart blocks", where the organ beats too slowly - but with their matching devices, they're both fighting fit.
Catherine, 41, first realised something was wrong in 2011, when she started to faint frequently.
After being diagnosed, she was fitted with her pacemaker, which immediately helped.
And three years later, she noticed her five-year-old Cairn Terrier was getting out of breath easily when they were walking on the beach.
Tests confirmed that Molly had the same heart condition and needed a Medtronic device - just like her owner!
The poorly pooch was flown to Herfordshire, where she underwent the £3,500 operation in the Queen Mother Hospital for Animals in North Mymms.
She said: "I was relieved. Having been through it myself, I knew she would be able to lead a healthy, normal life after it was fitted.
"Now we both see the same doctor for check-ups; I have my pacemaker checked during normal working hours, but we take Molly after hours when there aren't any other patients around."
It just shows, women can be a dog's best friend too!
By Caterina Rossi
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