The consumption of grapes and raisins presents a potential health threat to dogs. Their toxicity to dogs can cause the animal to develop acute kidney injury (the sudden development of kidney failure) with anuria (a lack of urine production).
Grapes, raisins, sultanas, & even currants are toxic to your dog! Ingestion of a small amount of grapes, or raisins, result in severe, acute kidney failure.The exact way these foods cause toxicity is still unknown and toxicity does not necessarily appear to be dose-dependent.
Grape toxicity is unpredictable this means that some dogs can spend their lives eating as many grapes as they like and nothing will ever happen, and other dogs can get severe life-threatening kidney failure from eating a single grape.

Grape toxicity in dogs may be due to tartaric acid, which causes kidney failure. Time will tell, but this could be one of the missing pieces of the puzzle. Hopefully, additional studies will continue to provide insight into how grape and raisin toxicity occurs.
Grape toxicity is linked to kidney damage. Eating grapes of any kind and in any form can result in sudden kidney (renal) failure and even death. Can dogs eat grape leaves? Grapes and grape leaves contain tartaric acid, a substance that affects the taste, smell, and quality of wine.

Many dogs ingest grapes or raisins with no harmful effects, and the scientific mechanism linking grapes and raisins to acute renal failure in canines is unknown.
Grape toxicity causes kidney failure in dogs. Signs associated with it are mainly those that develop when theres kidney insufficiency. These symptoms are usually acute and develop within 24 hours after ingestion.
Grapes can cause sudden kidney failure in dogs. There is no safe amount. Grapes are one of the most unpredictable food toxins in dogs.2Toxicity is unpredictable. Some dogs develop kidney failure after small amounts, while others may tolerate larger quantities.