With thanks to Ceiling Kitty 27/12/18. With some toxins, the size of the dog is relevant. With raisins, grapes etc, as far as we know it is of no relevance - a 40kg+ dog could eat a few raisins and go into renal failure, a terrier could eat a whole mince pie and be fine. I think this thread can be summarised as such: 1. Many dogs that consume raisins, grapes, sultanas etc will be fine, but: - the amount they ate will NOT tell you if they are going to be unwell; - the size of the dog will NOT tell you if they are going to be unwell. 2. The 'wait and see' approach falls down because it takes up to 48-72 hours before you will see any signs, by which time the kidneys are extremely damaged and may not be saveable. A proactive approach to prevent renal damage in the first place - induce vomiting if the raisins were consumed within the past few hours, fluid therapy to protect the kidneys - has a higher chance of saving the dog. 3. There is still a lot we don't know about this toxicity, and in general people who tell you 'it'll definitely be fine' just can't say that - unless they are privy to information not yet known to the VPIS. They are taking a guess, educated or otherwise, and many cases of course will be lucky enough not to suffer ill effects. This post is subject to updating as further information becomes available. As always, if you have any concerns about your pet's health please consult a veterinary surgeon.