🚨 If symptoms are present — go to emergency vet NOW. ASPCA Poison Control: (888) 426-4435 (24/7)
Rhubarb Toxicity in Dogs
Rhubarb (Rheum rhabarbarum) is a common garden plant whose large leaves are highly toxic to dogs. The leaves contain oxalic acid and soluble oxalates that crystallize in the kidneys, causing acute renal failure. The stalks contain lower oxalate levels but should still be kept away from dogs. This is a serious toxicity emergency.
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⚡ Immediate Actions
- 1Contact your vet or ASPCA Poison Control (888) 426-4435 immediately.
- 2Identify which part of the plant was eaten (leaves vs. stalks) and estimate quantity.
- 3Do not induce vomiting without veterinary guidance.
- 4Go to emergency vet promptly — kidney damage can develop within 24 hours.
- 5Keep your dog hydrated (offer water) during transport.
Symptoms & Timeline
Early phase (30 minutes – 3 hours)
- Drooling and oral irritation
- Vomiting
- Diarrhea
- Trembling
- Weakness
Kidney failure phase (12–48 hours)
- Decreased or absent urination
- Swollen, painful abdomen
- Lethargy and loss of appetite
- Blood in urine
- Dehydration
- Collapse
How Rhubarb (Rheum rhabarbarum) Affects Dogs
Rhubarb leaves contain high concentrations of soluble oxalates and oxalic acid. Once absorbed, oxalic acid binds calcium in the bloodstream, causing hypocalcemia and forming calcium oxalate crystals that deposit in kidney tubules, obstructing urine flow and causing direct tubular cell death. This leads to oliguric acute renal failure. The oral irritation is caused by calcium oxalate crystals piercing mucosal tissue.
What Your Vet Will Do at the Clinic
Step-by-step protocol:
- 1Induce vomiting if recent ingestion and dog is alert (veterinary guidance required)
- 2Activated charcoal to limit ongoing oxalate absorption
- 3IV calcium gluconate to correct hypocalcemia
- 4Aggressive IV fluid diuresis to flush oxalate crystals from kidney tubules
- 5Monitor BUN, creatinine, and calcium every 12 hours
- 6Urinalysis to detect calcium oxalate crystalluria
- 7Hospitalization for at least 48 hours; dialysis if severe renal failure develops
Frequently Asked Questions
Is rhubarb pie filling dangerous if my dog ate a small bite?
Rhubarb in baked goods uses the stalks, which have much lower oxalate content than leaves. A very small amount is unlikely to cause severe toxicity, but the pie filling also contains large amounts of sugar, which is harmful. Monitor for GI symptoms and call your vet if concerned.
How fast does rhubarb cause kidney damage?
Kidney damage from oxalate nephropathy typically develops over 12–48 hours after significant ingestion. The initial oral and GI symptoms appear within 30–60 minutes. Even if your dog seems to recover from initial vomiting, kidney values must be checked 24–48 hours later.
🛡️ Emergency vet bills average $1,500–$5,000
Most US dog owners pay out of pocket. Pet insurance can cover 70–90% of unexpected emergency costs.
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