dog ate a luna bar with raisins, will this kill her?

http://www.snopes.com/critters/crusader/raisins.asp

The above lists symptoms to watch for. If your dog starts vomiting you should probably see the vet.

If you are really concerned, call your vet and ask if you should bring the dog in. That's what I would do. I personally wouldn't want to just wait to see if symptoms appeared.

When my dog was a puppy, I was unaware that raisins could be toxic and I used them as treats to help her learn some basic commands because they were one of the few things she enjoyed that she didn't get regularly. I never gave her very many of them, and, thankfully, she had no ill effects. Before that, I had owned a dog who loved grapes--and also had no ill effects from them. So, it may also be an individual matter how raisins and grapes affect dogs. Knowing what I know now, I'd never let any dog have either of those things, but dogs can get a hold of things they shouldn't have...

While I agree you should call your vet, I also doubt that the amount of raisins in a Luna bar would be a problem even for a small dog. Of course, something else could be a problem. Luna bars are like multi vitamins - I'd be more concerned about a vitamin overdose than too many raisins.

Raisins in excess can cause renal failure in a dog.