Willow, a joyful standard poodle with a heart as big as her fluffy tail, trotted beside her dad, Peter, along their usual trail in Eagan, Minnesota. The wildlife had always kept its distance—until it didn’t.

Meet Tatum. Tatum recently graduated from Boston College with a degree in Biochemistry and is preparing to apply for medical school....

Willow, a joyful standard poodle with a heart as big as her fluffy tail, trotted beside her dad, Peter, along their usual trail in Eagan, Minnesota. The wildlife had always kept its distance—until it didn’t.