Foods That Are Toxic and Deadly to Rabbits

Rabbits are curious, food-motivated animals that will often try to eat things that are extremely dangerous to them. Unlike cats, rabbits cannot vomit — once a toxic substance is swallowed, it enters the digestive system completely. This makes knowing which foods are toxic absolutely critical for every rabbit owner.

If you suspect your rabbit has ingested something toxic, call an exotic vet immediately — do not wait for symptoms to appear.

The Most Dangerous Foods for Rabbits

Avocado — FATAL

Avocado contains persin, a fungicidal toxin that is deadly to rabbits even in small quantities. Every part of the avocado plant is toxic: flesh, skin, stone, and leaves. Persin causes myocardial tissue damage, respiratory distress, and cardiac failure. There is no antidote. Avocado must never be within reach of a rabbit.

Onions, Garlic, Leeks, Chives — HIGHLY TOXIC

All members of the Allium family destroy red blood cells in rabbits, causing Heinz body haemolytic anaemia — a severe breakdown of red blood cells leading to weakness, pale gums, laboured breathing, and potentially death if untreated. This applies to raw, cooked, and powdered forms. Any food containing alliums (soups, sauces, flavoured snacks) must be kept away from rabbits.

Chocolate — TOXIC

Chocolate contains theobromine and caffeine, both toxic to rabbits. These stimulate the central nervous system and heart, causing tremors, seizures, arrhythmias, and death. Dark chocolate and cocoa powder are the most dangerous due to higher theobromine concentrations.

Rhubarb — TOXIC

Rhubarb contains very high concentrations of oxalic acid in both the stalks and leaves. Oxalic acid binds with calcium in the body to form calcium oxalate crystals, damaging the kidneys and causing dangerous hypocalcaemia. Rhubarb — including garden rhubarb plants — must never be accessible to rabbits.

Potatoes and Tomato Leaves — TOXIC

Raw potatoes and potato skins contain solanine, a glycoalkaloid compound concentrated in the green parts, skin, and any sprouting areas. Tomato leaves and stems also contain solanine and tomatine. While ripe tomato flesh can occasionally be offered in tiny amounts, the plant itself must be kept out of reach.

Iceberg Lettuce — HARMFUL

Iceberg lettuce contains lactucarium, a mildly narcotic substance that causes sedation and watery diarrhoea in rabbits. It provides virtually no nutrition. Never feed iceberg lettuce — use romaine or other dark-leaf lettuces instead.

Muesli-Style Rabbit Food Mixes — HARMFUL

Not acutely toxic, but muesli mixes cause dental disease, obesity, and cecal dysbiosis through selective feeding. The RWAF and PDSA officially recommend against them, and the UK Government’s Code of Practice for Rabbit Welfare advises owners to avoid them.

Nuts and Seeds — HARMFUL

High fat content is inappropriate for rabbit digestive systems. Nuts and seeds cause digestive upset and weight gain. Sunflower seeds, walnuts, almonds, and peanuts should never be fed.

Raisins and Dried Fruit — HARMFUL

Dried fruits have dramatically concentrated sugars — a single raisin contains as much sugar as many fresh grapes. Avoid completely.

Toxic Garden and Houseplants

Many common plants are toxic to rabbits. If your rabbit has access to any outdoor space or you have houseplants, verify every single plant is safe. The most dangerous include:

Plant	Toxic Component	Risk Level
Foxglove (Digitalis)	Cardiac glycosides	FATAL
Lily of the Valley	Cardiac glycosides	FATAL
Deadly Nightshade	Atropine, solanine	FATAL
Oleander	Oleandrin	FATAL
Ragwort	Pyrrolizidine alkaloids	FATAL (cumulative)
Daffodil bulbs	Lycorine	HIGHLY TOXIC
Rhubarb leaves	Oxalic acid	HIGHLY TOXIC
Ivy (all types)	Saponins, falcarinol	TOXIC
Poppy	Alkaloids	TOXIC
Bluebells	Glycosides	TOXIC
Philodendron	Calcium oxalate	TOXIC
Aloe Vera	Anthraquinones	TOXIC

If You Suspect Poisoning — Act Immediately

Do not wait for symptoms to develop. By the time a rabbit shows visible toxic symptoms, significant damage has often already occurred.

1. Call your exotic vet or emergency vet immediately — even out of hours
2. Do NOT try to make the rabbit vomit — rabbits physically cannot vomit; attempting to induce it causes additional harm
3. Note what was eaten and how much — bring a sample of the plant or food packaging if possible
4. Note the time of ingestion — this helps the vet assess how much may have been absorbed
5. Keep the rabbit warm and calm — stress worsens most toxic reactions

The RabbitCare App’s Safe Food Guide

The RabbitCare App (free on Android) contains a built-in safe/unsafe food database. Before offering your rabbit anything unfamiliar from the kitchen or garden, or if a well-meaning visitor tries to share a snack, the app provides instant, reliable answers about what’s safe, what’s toxic, and what should only be given in limited quantities.

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References & Sources

1. House Rabbit Society (HRS) — “Foods That Can Be Dangerous to Rabbits” — rabbit.org
2. PDSA — “Dangerous and toxic items for rabbits” — pdsa.org.uk
3. RWAF — “Rabbit Poisoning” — rabbitwelfare.co.uk
4. Varga, M. (2014) — Textbook of Rabbit Medicine, 2nd ed., Elsevier
5. Harcourt-Brown, F. (2002) — Textbook of Rabbit Medicine, Butterworth-Heinemann
6. UK Government — Code of Practice for the Welfare of Rabbits, DEFRA