Raisins, onion and garlic are harmful to dogs. This book references raisins on one page; onions on 41 pages; and garlic on 49 pages.According to the ASPCA:" . . .Garlic does have toxic potential to pets, and is generally more potent than onion, . . .""grapes and raisins appear to cause renal failure in dogs who've ingested large amounts." "it is advisable not to give grapes or raisins to dogs in any amount."