Can Dogs eat Sultanas?
Never feed sultanas to your dog — treat any ingestion as an emergency.
Sultanas belong to the grape family and share the same unidentified nephrotoxic principle as grapes, raisins, and currants. The toxin responsible has not yet been isolated with certainty, but the clinical consequence — acute renal tubular necrosis — is well documented. What makes sultanas particularly dangerous is that there is no reliably safe dose: some dogs develop life-threatening kidney failure after eating just a small handful, while others appear unaffected by larger amounts. Because this idiosyncratic response cannot be predicted in advance, veterinary toxicologists universally advise zero tolerance.
Immediate Action Required
If your dog has eaten Sultanas, do not wait for symptoms to appear. Prompt veterinary intervention can prevent serious harm.
Why are sultanas so dangerous for dogs?
Sultanas are simply dried white grapes — seedless varieties that go through a dehydration process, which concentrates whatever nephrotoxic compound grapes naturally contain. The drying process raises the concentration per gram dramatically compared to fresh grapes, making sultanas gram-for-gram far more hazardous. Raisins, sultanas, currants, and Zante currants all share this risk profile, and all should be kept entirely out of a dog's reach.
The precise toxic mechanism remains the subject of ongoing research. Tartaric acid has recently emerged as a leading candidate — dogs lack the renal enzymatic machinery to efficiently excrete it, leading to tubular cell damage and progressive loss of kidney function. Regardless of the exact biochemistry, the clinical outcome is the same: proximal renal tubule necrosis, oliguric or anuric renal failure, and potentially fatal uremia if not treated rapidly. The unpredictability of individual susceptibility — some dogs survive large ingestions while others die from a few sultanas — means there is no safe lower limit that veterinarians can recommend.
Unlike many foods where small amounts are acceptable, sultanas have no established safe threshold for dogs. Veterinary toxicologists advise treating any ingestion as a potential emergency, regardless of the quantity eaten.
Symptoms & progression
- Vomiting — often the first and most consistent sign
- Diarrhea (may contain partially digested sultanas)
- Lethargy and weakness
- Abdominal pain or hunched posture
- Loss of appetite
- Reduced or absent urination (oliguria/anuria)
- Excessive thirst and increased urination (paradoxically, early in toxicosis)
- Halitosis with a uremic or 'chemical' odor
- Tremors or muscle twitching
- Severe lethargy progressing to unresponsiveness
- Complete cessation of urination
- Oral ulcers
- Seizures
- Cardiovascular instability
- Coma
Dose & severity
There is no dose of sultanas that can be considered safe for dogs. The table below illustrates why quantity should never be used to guide a wait-and-see decision.
What to do if your dog eats sultanas
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1
Act immediately — do not wait for symptoms. Kidney damage may be progressing silently before any outward signs appear. The window for effective decontamination is short — ideally within 1–2 hours of ingestion.
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2
Call your veterinarian or an animal poison helpline right away. Contact the ASPCA Animal Poison Control Center (888-426-4435), the Pet Poison Helpline (855-764-7661), or your nearest emergency veterinary clinic. Have the approximate quantity eaten and your dog's weight ready.
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3
Do not induce vomiting at home without professional guidance. Your vet will advise whether emesis is appropriate based on the time elapsed and your dog's condition. Hydrogen peroxide administration in particular can cause hemorrhagic gastroenteritis in dogs and should only be used under veterinary instruction.
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4
Expect hospitalization. Treatment typically involves intravenous fluid therapy for 48–72 hours, repeated blood tests to track kidney values (BUN, creatinine, phosphorus), and monitoring of urine output. Early and aggressive fluid diuresis is associated with significantly better outcomes.
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5
Monitor urine output closely. At home after discharge, watch for straining to urinate, very dark urine, or your dog stopping urination entirely — these are signs of renal compromise and require urgent re-evaluation.
Safe alternatives
Dogs don't need sultanas — many fruits are genuinely safe and make excellent occasional treats instead.
Rich in antioxidants and low in sugar; a well-documented safe fruit treat for dogs in moderate amounts.
Hydrating and palatable; the flesh is safe and dogs typically love it in summer.
A crunchy, fiber-rich snack; apple seeds contain amygdalin and must be removed, but the flesh is safe.
High in vitamins A, C, and E; the soft flesh is digestible and safe as an occasional reward.
Easily digestible and rich in potassium; best given in small slices due to natural sugar content.
Frequently asked questions
My dog just ate one sultana from a dropped scone — do I really need to go to the vet?
Why are sultanas more dangerous than fresh grapes?
My dog ate sultanas yesterday and seems fine — is it still dangerous?
Are sultanas in baked goods like fruitcake, hot cross buns, or scones just as dangerous?
Is there an antidote for sultana poisoning in dogs?
Sources & references
- ASPCA Animal Poison Control Center — Grapes, Raisins & Sultanas: Toxicosis in Dogs (clinical case database)
- Merck Veterinary Manual — Grape and Raisin Toxicity in Animals
- Wegenast CA, et al. 'Acute kidney injury in dogs following ingestion of cream of tartar and tamarinds and the connection to tartaric acid as the proposed toxic principle in grapes and raisins.' Journal of Veterinary Emergency and Critical Care, 2022
- Pet Poison Helpline — Raisins and Grapes: Toxicity Profile for Canines
About the author: Dra. Carmen Ortega
Diplomate of veterinary nutrition focused on species-appropriate diets and preventative feeding, and lead author of our dietary guidance.
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