Grape & Raisin Toxicity Calculator for Dogs

The toxic principle in grapes and raisins is still unknown, and individual sensitivity varies wildly — meaning there is NO established safe dose. While the veterinary threshold is approximately 1.4 g/kg for grapes and 0.7 g/kg for raisins, a 20 lb dog could be affected by as few as 2-3 grapes in sensitive cases. Some dogs eat large amounts without issue; others develop acute kidney failure after a single grape. Always treat any ingestion seriously and contact your vet.

Call your veterinarian or ASPCA Poison Control at (888) 426-4435 immediately — do not wait for symptoms to appear, as kidney damage can begin within hours. If ingestion occurred within the last 2 hours and your vet approves, you may be instructed to induce vomiting with 3% hydrogen peroxide (1 tsp per 10 lbs of body weight, maximum 3 tbsp). Standard veterinary treatment includes IV fluids for 48-72 hours to flush the kidneys and protect against acute renal failure, along with bloodwork to monitor kidney values (BUN and creatinine).

Symptoms typically begin within 6-12 hours of ingestion. Early signs include vomiting (often the first symptom), lethargy, increased thirst, and decreased appetite. As kidney failure develops, you may notice reduced or absent urine output — this is a major red flag for acute renal failure. Other later symptoms include abdominal pain, dehydration, bad breath (uremic odor), and tremors. Bloodwork (BUN, creatinine, phosphorus) is needed to confirm kidney damage. Without prompt treatment, kidney failure can be fatal within 3-4 days.