According to PetMD: Cat periodontal disease, or gum disease in cats, is an inflammation of some or all of a tooth’s deep supporting structures. It is one of the most common diseases in cats today.

Check out this handsome dude! Meet Capone, a 1-year-old mixed pup who means the world to his mommy! "My dog is my baby and he means the world to me," his mom says. Unfortunately, Capone decided to try raisins as a snack. His mom, who knew that raisins were very toxic to pets, called her veterinarian right away and rush Capone to the office. At the vet they were able to induce vomiting, luckily before the raisins were even digested.  According to the Pet Poison Helpline:

Grapes, raisins, sultanas, and even currants (some currants are actually small, black raisins) are toxic to your dog! There have also been anecdotal reports of cats and ferrets being affected. Ingestion of even a small amount of grapes, raisins, or currants can result in severe, acute kidney failure. 

Vomiting is generally seen within 24 hours following ingestion. Lack of appetite, lethargy, and possibly diarrhea can be also seen within the next 12-24 hours. 

More severe signs are not seen for 24-48 hours after ingestion – often after acute kidney failure has already begun. Signs of acute kidney failure include nausea, lack of appetite, vomiting, uremic breath, diarrhea, abdominal pain, excessive thirst, and excessive urination.
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As the poisoning progresses, the kidneys may shut down and the dog will not produce any urine. Following this, the dog's blood pressure will increase dramatically and the dog will usually lapse into a coma. Once the kidneys have shut down and urine output has dropped, the prognosis is poor.