Dog ate grapes or raisins

You came here to ask 'how many is dangerous?' The honest answer — the one that separates real veterinary guidance from content-farm calculators — is that nobody knows, and that's exactly why this is a call-the-vet-now situation at any amount.

Why we won't build a grape calculator

We built a chocolate calculator and axylitol calculator, because those toxins have published dose-response numbers you can do math with. Grapes don't. The toxicity isidiosyncratic: there are documented cases of kidney failure after a single grape, and dogs that ate a whole bunch without harm — and veterinary medicine still cannot test in advance which kind of dog yours is. (The leading suspect is tartaric acid, which also varies wildly between grape varieties and even between batches.) Any site that gives you a grapes-per-pound threshold is inventing precision that toxicologists say does not exist. That's why the answer to "how many is too many?" is a question reframed: any amount is a phone call.

The timeline that matters

• 0–2 hours: the golden window. A vet can often induce vomiting and recover the grapes before absorption. This is the single biggest reason to call immediately instead of watching.
• 2–12 hours: if signs appear, they're usually GI first — vomiting, diarrhea, lethargy, poor appetite. But absence of signs means nothing; plenty of kidney-injury cases showed no early symptoms at all.
• 24–72 hours: this is when kidney injury shows up on bloodwork — rising creatinine and BUN, changes in urination (either excessive or, ominously, very little). Vets often recommend baseline kidney values now and a recheck in this window.

What the vet will actually do (and roughly what it costs)

For a recent ingestion: induced vomiting (typically $75–$200 at a regular clinic, more at an ER), often followed by activated charcoal. For larger or later ingestions, or any dog showing signs: IV fluids for 24–48 hours to protect the kidneys, with serial bloodwork — commonly $800–$2,500+ depending on region and duration. Expensive, but it's the version of this story where the kidneys survive; treated early, most dogs do fine. Kidney failure treated late is a far worse bill and a far worse outcome. If cost is the obstacle, say so on the phone —here's how to ask, and what help exists.

Don't do these

• Don't induce vomiting at home unless a vet or poison control explicitly instructs you and tells you how. Done wrong, it adds aspiration pneumonia to your problems.
• Don't wait for symptoms. The dogs that get in trouble are usually the ones whose owners watched a symptom-free dog for two days.
• Don't forget the relatives: raisins are more concentrated than grapes, and they hide in trail mix, cookies, hot cross buns, and cinnamon-raisin bread. Currants and sultanas count too.

Need a vet who's open right now?Find the nearest emergency clinic and call on the way. For everything else your dog might have eaten, see the full poisoning guide.