Out of curiosity, what symtoms did Sammy exhibit after eating the raisins?

Our golden retriever ate an ENTIRE chocolate cake off the counter while we were out. She's 65 lbs. I looked online and called the vet (Like you, I had been at the vet the day before to put my 17 year old cat down), and I did not want to have to go back to the vet. What they told me was that, while chocolate is toxic to dogs, it's not necessarily the chocolate that would make her sick. The SUGAR from eating an entire cake was far worse for her and could cause her to go into pancreatic shock. Since I didn't want to go back to the vet, I told them I saw I could enduce vomitting with H2O2 and asked how much to give her. I had a large, plastic "syringe" from a bar (some sort of shot came in it), and I pulled up about 1/2 cup of peroxide and shot it in the back of her throat to make sure she got it down. It didn't take long! Not 5 minutes later she was threw up CHUNCKS of the cake - I literally could have arranged the pieces back into the original cake!!! She doesn't really chew anything and just bit off pieces small enough for her to swallow whole (about the size of a fist each). We just kept an eye on her and she was fine - no stomach or anything; but we were fortunate enough to catch it in less that 2 hours after ingestion and were able to get her to vomit.

Unfortunately, she will eat anything, and the kitten thinks it's funny to watch her and knocks stuff off the counter for her to get (so now we have to keep it in the pantry and cabinets). She ate about a dozen chocolate chip cookies once without any issues (that amount of chocolate wasn't enough for a dog her size), but after the cake and knowing about how sugar can affect them, we probably should have done something then, too.