The vets at Pet Poison Helpline recently looked back at the top ten most common dog emergencies in 2011. The results give pet owners and vets clues to look out for 2012 and information about what to avoid in order to keep pets safe!   1. Foods -- specifically chocolate, xylitol, and grapes/raisins. Certain types of chocolate are very toxic to dogs. The chemical causing toxicity in chocolate is theobromine (a relative of caffeine). The darker, more bitter...