MY FIRST DOG WHO WAS A WIENER DOG, GOT INTO MY EASTER BASKET AND ATE ALL OF MY CHOCOLATE BUNNY AND SHE DIDN'T DIE, SHE JUST HAS A MASSIVE POOP THOUGH :/ NO BIGGIE ^^
I doubt a one-off chocolate event will kill a dog, but repeated consumption of chocolate over a period of time has very harmful potential. I had a relative who fed his dog chocolate regularly and the dog eventually began having seizures.