Dog Raisin Toxicity Calculator

Are Raisins Toxic to Dogs?

Yes, raisins and grapes are extremely toxic to dogs. Even small amounts can cause acute kidney failure, which can be fatal if not treated promptly. The exact toxic substance in grapes and raisins has not been definitively identified, but recent research suggests tartaric acid and potassium bitartrate may be the culprits. Other suspected compounds include mycotoxins (fungal toxins) and salicylates (plant compounds).

The toxicity is unpredictable — some dogs may eat grapes without apparent harm, while others become severely ill from just a few. This unpredictability makes it essential to treat every case of grape or raisin ingestion as a potential emergency.

How Much Raisin is Toxic to Dogs?

The toxic dose of raisins for dogs is approximately 2.8 grams per kilogram of body weight (0.04 oz per pound). For grapes, the toxic dose is approximately 19.6 grams per kilogram (since grapes contain more water and weigh more than raisins). However, toxicity has been reported at doses even lower than these thresholds.

For a 28-pound (12.7 kg) dog, the toxic threshold is approximately 35.6 grams of raisins or 249 grams of grapes. Since individual raisins weigh approximately 0.5 grams, as few as 71 raisins could be toxic for this dog. For a small 10-pound dog, the threshold drops to just about 12.7 grams of raisins, or roughly 25 raisins.

Toxic Dose Reference Table by Dog Weight

Dog Weight	Weight (kg)	Toxic Raisin Dose (g)	Approx. # Raisins	Toxic Grape Dose (g)	Approx. # Grapes
5 lbs	2.3 kg	6.3 g	~13	44.4 g	~9
10 lbs	4.5 kg	12.7 g	~25	88.9 g	~18
20 lbs	9.1 kg	25.4 g	~51	177.8 g	~36
30 lbs	13.6 kg	38.1 g	~76	266.7 g	~53
50 lbs	22.7 kg	63.5 g	~127	444.4 g	~89
70 lbs	31.8 kg	89.0 g	~178	622.2 g	~124
100 lbs	45.4 kg	127.0 g	~254	888.9 g	~178

Symptoms of Raisin Poisoning in Dogs

Symptoms typically appear within 6–12 hours of ingestion and may progress through several stages:

Early Symptoms (6–12 hours)

• Vomiting (often with grape/raisin residue visible)
• Diarrhea
• Lethargy
• Loss of appetite
• Abdominal pain and tenderness
• Dehydration

Progressive Symptoms (24–72 hours)

• Decreased or absent urination (oliguria/anuria)
• Excessive thirst
• Kidney pain
• Nausea
• Bad breath (uremic breath)
• Oral ulcers

Severe Symptoms (if untreated)

• Acute kidney failure
• Seizures
• Coma
• Death

What to Do If Your Dog Eats Raisins or Grapes

1. Stay calm but act fast — time is critical
2. Determine what and how much your dog ate
3. Note when the ingestion occurred
4. Call your veterinarian or emergency animal hospital immediately
5. Do NOT induce vomiting unless explicitly instructed by a veterinarian
6. If directed, bring your dog to the vet immediately
7. Bring the packaging or remaining raisins/grapes with you

Treatment for Raisin/Grape Toxicity

There is no antidote for grape/raisin toxicity. Treatment is supportive and may include:

• Induced vomiting (within 2 hours of ingestion, performed by a veterinarian)
• Activated charcoal to help absorb remaining toxins in the digestive tract
• Aggressive IV fluid therapy for 48–72 hours to support kidney function
• Monitoring of kidney values (BUN, creatinine) through blood tests
• Anti-nausea medications to control vomiting
• Kidney function monitoring for several days after ingestion

Early treatment significantly improves outcomes. Dogs that receive aggressive fluid therapy within hours of ingestion generally have a much better prognosis than those who are treated later.

Why Are Raisins More Dangerous Than Grapes?

Raisins are dried grapes, which means the toxic compounds are more concentrated. One raisin contains roughly the same amount of toxic substance as one grape, but in a much smaller package. This means dogs can easily consume a larger toxic dose of raisins because they are smaller and easier to eat in larger quantities.

Consider this: a handful of raisins might contain 30–40 individual raisins, while a handful of grapes might only contain 8–10. This makes raisins especially dangerous around the home, as dogs can quickly eat a significant amount before their owner even notices.

Prevention

The best way to protect your dog is to eliminate exposure entirely:

• Keep all grapes, raisins, currants, and products containing them securely stored out of your dog's reach
• Be aware of hidden sources: trail mix, cereal, cookies, bread, fruit salad, wine
• Educate all family members and visitors about the danger of grapes and raisins to dogs
• Check ingredient lists of snacks and baked goods before sharing any food with your dog
• Be cautious at parties and gatherings where these foods may be left within reach
• If you have grapevines in your yard, ensure your dog cannot access fallen grapes

Frequently Asked Questions