How much grape or raisin does it take to poison a dog or cat?

Individual sensitivity varies greatly and no safe lower threshold has been established — even small amounts can cause toxicity. Contact your vet or a pet poison control service immediately if ingestion is suspected.

What tests will the vet run at the clinic?

The vet will typically perform a physical examination, complete blood count and biochemistry panel, urinalysis, and abdominal imaging (ultrasound or X-ray) to evaluate kidney function and dehydration.

Does my pet still need to see a vet if they vomited the food straight away?

Yes — a vet assessment is still recommended because toxin absorption may have already occurred and kidney damage can develop over time. The vet will determine whether observation or further testing is needed.

How long does follow-up care last after treatment?

Blood and urine tests need to be monitored after treatment. Common recheck schedules are one week and two to four weeks after discharge, with further follow-up as determined by your vet.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Grape & Raisin Toxicity in Dogs and Cats: Vomiting, Appetite Loss & Kidney Function [2025]

Grapes and raisins are nephrotoxic to dogs and can cause acute kidney failure even in small amounts. Seek veterinary care immediately after ingestion — early treatment leads to a better prognosis.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: ASPCA, AVMA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•Persistent, severe vomiting with inability to drink water or eat normally
•Noticeably reduced urine output or near-complete absence of urination within a short period
•Seizures, coma, or sudden loss of consciousness

Schedule a Clinic Visit Soon (within 24–72 hours)

•Significantly reduced appetite or complete refusal to eat for several hours
•Recurring intermittent vomiting more than twice without improvement
•Marked lethargy or noticeable change in mental status

01What symptoms indicate something is wrong?

After ingesting grapes or raisins, pets commonly first show gastrointestinal and behavioural changes, which may progress to kidney dysfunction.

Lethargy, obvious drowsiness, or reduced energy
Decreased appetite or complete refusal to eat
Frequent or repeated vomiting
Diarrhoea or obvious abdominal discomfort and bloating
Signs of dehydration such as dry mouth and reduced skin elasticity
Obvious discomfort or pain response during movement

Seek emergency care immediately if you notice the following symptoms:

⚠️ Persistent vomiting with inability to drink water or eat
⚠️ Markedly reduced urine output or near-complete absence of urination within a short period
⚠️ Seizures, loss of consciousness, or sudden collapse

02How should you assess the situation at home? Key observations and emergency warning signs

Observing and recording key information at home helps the vet quickly assess the severity of the poisoning and prioritise treatment.

Record the time of suspected ingestion and estimate the amount consumed
Note the timing of any changes in alertness or willingness to eat
Log the number of vomiting episodes, timing, and contents of vomit
Monitor and record any blood in stools or abnormal faeces
Estimate changes in water intake and urine output, and whether your pet can drink on its own
Use your phone to record video of vomiting, gait, or any abnormal behaviour for the vet's reference
If ingestion is suspected, contact your vet immediately or bring your pet to a clinic for assessment

03How will the vet diagnose the condition? Common tests and examinations

The vet's primary focus is assessing kidney damage, degree of dehydration, and whether hospitalisation is required — blood and urine tests are central to this.

Full physical examination to assess vital signs and degree of dehydration

Complete blood count and biochemistry panel with emphasis on kidney markers

Urinalysis (specific gravity, sediment, protein) to evaluate kidney function

Abdominal ultrasound to assess kidney structure and urinary tract changes

X-rays if needed to rule out other gastrointestinal foreign bodies or complications

Seek care at a clinic equipped to perform blood biochemistry and urinalysis

04What treatment and home care are needed after diagnosis? Medication, diet, and care guide

Poisoned pets may require hospitalisation for IV fluid therapy and ongoing monitoring; kidney function and hydration must continue to be monitored after discharge.

Hospitalisation for IV fluids and close vital sign monitoring may be required during the acute phase
Administer medications as prescribed and attend follow-up appointments to track test results
After discharge, continue monitoring and recording water intake, urine output, and alertness
Schedule regular rechecks with blood and urine tests to assess kidney recovery
Keep your pet away from all foods containing grapes or raisins going forward
If kidney function is abnormal, follow up at a clinic capable of performing nephrology tests

05What should you prepare before the vet visit? Key information to help the vet act quickly

Note the suspected time of ingestion, the type of food, and the estimated amount

Photograph or bring samples of vomit, any remaining food, or its packaging

Record when symptoms started, how they progressed, and your pet's current condition

List all current medications, supplements, and known allergies

Estimate and record changes in water intake and urine output for the vet's reference

Call ahead to a clinic equipped for emergency diagnostics or contact a pet poison control hotline

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.