I'm so sorry for your loss. Thanks for this very important reminder though.
As a matter of fact I was just reading....gee z...was it the Whole Dog Journal or Dog Fancy? I'm sure it was the WDJ in the new issue, they have a great article on toxic foods for pets. It was enlightening for me, as there were some things on the list I would never have thought of. Chocolate is the one I always remember, but the grapes, raisins, onions, and a few other things were surprising for me.
Checkout the article if you can, its very good.