Grapes can be harmful (not sure why and my old dog used to eat loads of them with no ill effects before we heard of this).
Tomatoes I believe are okay - hope so because Loki absolutely loves them.

Never did my dogs any harm, in small amounts, of course.

Luna loves tomatoes... and has them in her veggie mix

Hi Iwlass, I give my dog raisins quite regular as I feed them to the blackbirds and thought they would be a good snack for her . Not any more though, thanks for that.

omg i had no idea that grapes where harmful to dogs,my max loves em.thankfully i only found this out tonight when iwas eating some i shared a few with max.I would have quite happily carried on feeding them to him as they are a fruit i would have thought they would have been good for him!