Is there enough chocolate in 11 oz of valentine candy to hurt a 16 lb dog?

It depends on the type of chocolate. Dark chocolate is more toxic to dogs than milk chocolate, and white chocolate is not toxic at all. Theobromine is a compound found in chocolate that can be toxic to dogs. A 16 lb dog could potentially be harmed by eating 11 oz of dark chocolate, but it is unlikely to be fatal. If you are concerned that your dog has eaten chocolate, contact your veterinarian immediately.