Guess high if you are not sure. Count the ones missing from the bunch or packet.
One grape weighs roughly 5 g.
Any amount is a concern
2.51 g per kg body weight
Vomiting is usually the first sign, within 24 hours. Kidney injury can follow 24 to 72 hours later, sometimes without warning.
Call a vet or a poison control line now, whatever the amount. There is no dose considered safe, and treatment is far more effective before signs appear.
- Amount eaten
- 50.0 g
- Lowest reported toxic dose
- 19.6 g/kg
- Percentage of that dose
- 13%
Treat that percentage with caution. It compares against the lowest dose ever reported to cause harm, not against a safe limit. Dogs have developed kidney failure after a single grape, and others have eaten far more with no effect at all. Susceptibility appears to be individual and cannot be predicted.