Claire Guest, today CEO of Medical Detection Dogs, has discovered she had breast cancer thanks to her Labrador mix Daisy, who kept pointing her nose to one of her owner’s breasts.

Penelope, Suzie Thomas’ Pinscher toy, persistently licked and scratched a small lesion on her owner’s leg. Suzie found this behaviour quite odd, and decided to have the lesion checked by a dermatologist, only to found out it was a malign melanoma.