Grapes & raisins can be dangerous
This is a relatively newly discovered toxicosis of dogs. So far, it does not appear to be related to pesticide use as cases have occurred in dogs that had eaten organic grapes. The agent is still unknown, so "safe" levels can not be determined. There have been cases reported of dogs that have habitually "harvested" grapes from home vines for years that suddenly developed toxicity. The safest thing to do is to avoid them altogether as treats for your pets, certainly no more than 1 or 2 should be given in a week, but even that amount has caused problems. http://www.aspca.org/site/News2?page...ticle&id=16645 If the poison control link sparks your interest, google on "dogs + grapes +toxicity" to get lots of other leads.
I know how much we all love our dogs, but this is something lots of people, including vets, aren't aware of.