We had to interrupt the celebration to figure out what was going on. We called security, and the woman was escorted off the premises. Only a few days later did we learn the terrifying truth about why the dog acted that way and who this woman really was  Continued in the first comment 

It turned out the woman was the mother of my ex-girlfriend. We had dated before I met my wife. After our breakup, she went through a very difficult time — lost her job, left the city, and was on the verge of a breakdown.

Her mother blamed me for everything and believed I had “ruined” her daughter’s life. She had come to the wedding to sabotage it. What exactly she had planned, we don’t know. But Koko sensed something was wrong before anyone else.

If it hadn’t been for him… I don’t even want to imagine what could have happened.

Since then, I’ve stopped thinking of my dog as just a pet — he’s my true guardian angel.