We were on the verge of giving up our golden retriever, Beau. He’d started barking nonstop at our new nanny, Claire, and it was becoming unbearable. We thought he was just jealous or struggling to adjust to the baby. But everything changed the night I decided to check our security camera footage—and what I discovered made my blood run cold.

When our daughter Zoey was born, our lives were filled with overwhelming joy. My wife Rose and I had tried for years to have a child. Continues…