Is Citrus (Lemons, Limes, Oranges, Grapefruit) Toxic to Cats and Dogs?
Citrus is mildly toxic to both cats and dogs — the oils in peel, pith, and leaves cause drooling and stomach upset. A small piece of flesh is usually harmless.
Usually minor, but watch for symptoms.
Usually minor, but watch for symptoms.
In an emergency, do not wait.
Medical disclaimer: This tool is for general information only and isnot a substitute for veterinary diagnosis or treatment. Toxicity depends on the amount, your pet’s size, and health history. If your pet may have ingested something harmful, contact your veterinarian or a poison control hotline ((888) 426-4435 / (855) 764-7661) immediately — do not wait for symptoms to appear.
What is Citrus (Lemons, Limes, Oranges, Grapefruit)?
Citrus is mildly toxic to both cats and dogs — the oils in peel, pith, and leaves cause drooling and stomach upset. A small piece of flesh is usually harmless.
Also known as: lemon, lime, orange, grapefruit, citrus peel, lemon rind, citric acid, key lime, clementines, tangerines.
Symptoms to Watch For
🐕 In Dogs
- Drooling from the sour, irritating oils
- Vomiting and mild diarrhea after eating peel, pith, or large amounts of flesh
- Skin or mouth irritation from contact with the oils
- Serious effects require large amounts of peel or leaves — uncommon
🐈 In Cats
- Drooling and mouth irritation (cats find citrus strongly aversive)
- Vomiting after licking peel or eating flesh
- Skin irritation from citrus oils
- Serious effects are rare — cats rarely eat citrus
What to Do If Ingested
- Remove any remaining peel or fruit.
- Rinse the mouth with water to clear the sour oils.
- Offer water and watch for vomiting.
- Call a vet only if vomiting persists or a large amount of peel was eaten.
Steps apply to both cats and dogs. When in doubt, call a vet or poison hotline before acting. Have a cat? Run the Pet Poison Triage Wizard for cat-specific steps.
When to Call the Vet Immediately
Call your veterinarian or a poison control hotline right away if you notice any of these:
- A large amount of peel, pith, or leaves was eaten
- Persistent vomiting or diarrhea
- Tremors or unusual weakness (rare)
Frequently Asked Questions
Frequently Asked Questions
Can dogs eat oranges or apples-like fruit safely?
A small segment of peeled orange is generally harmless for a dog — the fruit flesh is low in the irritating compounds. The problem is the peel, pith, seeds, and leaves, which concentrate psoralens and essential oils (limonene, linalool) that irritate the mouth and stomach. Treat peel-heavy snacking, and any grapefruit (more psoralens), as the risky version.
Why does my cat hate lemons so much?
Cats are strongly averse to citrus smell — their noses and mouths are far more sensitive to the essential oils, and many cat-deterring sprays are literally citrus-scented for this reason. A cat that licks a lemon will usually drool and retreat immediately. Actual poisoning needs the cat to eat meaningful amounts of peel or leaves, which their own aversion makes rare.
Are citrus essential oils the same risk?
No — concentrated citrus essential oils are a much bigger hazard, especially for cats, whose livers cannot process the oils. Diffused or undiluted citrus oil can cause drooling, tremors, and breathing trouble in cats. See our essential oils page for that risk; a fruit bowl lemon is a mild problem, but a bottle of lemon essential oil is not.
Sources
This entry is reviewed against the following authoritative veterinary sources.
- ASPCA — People Foods to Avoid Feeding Your Pets
- Merck Veterinary Manual — Toxicology
- Pet Poison Helpline — Poisons
Last reviewed: 2026-10-16