How long does it take for a dog to die from chocolate poisoning once he starts showing signs?

My dog is twenty three pounds and chewed through a plastic box of cookies with about a dozen chocolate hershey kisses. That was about 72 hours ago. Last night he seemed to be shaking uncontrollably almost like he was cold, ended up urinating a huge puddle on the floor-shaking stopped- and nothing has happened since, he has been barking at loud noises a little bit more frequently than usual but he started calming down last night. His food and water intake hasn’t changed and he never had any stomach issues (diarrhea,k vomiting, etc.) or any extra bursts of energy like I would have expected from eating the chocolate. Does he have a bladder infection, chocolate poisoning, or something else?