Rabbit feeding advice usually talks about balance and variety, but this question is about the short list where balance does not apply. These foods should never be offered to a rabbit in any amount, as a treat, as a scrap, or as an experiment. A rabbit's digestive system is a fiber-processing system that depends on constant gut movement, and the foods below either poison that system directly or disrupt it badly enough to become an emergency.
The Never List, Food by Food
Raw potatoes must never be fed. Raw potato contains solanine, a compound that is toxic to rabbits, and starchy cooked potato is no favor either for a gut built for fiber. Avocado must never be fed in any form, flesh, skin, or stone, because compounds in the fruit are dangerous to rabbits and its richness alone overwhelms their digestion. Onions and all alliums, including garlic, leeks, shallots, and chives, must never be fed, fresh, cooked, dried, or powdered in other foods, because alliums damage red blood cells in rabbits.
Chocolate must never be fed, in any type or amount, because the stimulants it contains are toxic to rabbits and small bodies reach dangerous exposure quickly. Rhubarb leaves must never be fed; the leaf is the toxic part of the plant even where stalks appear in human cooking, and a rabbit should not be offered rhubarb at all. Human snack foods must never be fed as a category: cookies and crackers, cake, bread, chips, breakfast cereals, nuts, seeds, and dairy products all fail a rabbit, whether through sugar, starch, fat, or ingredients their gut cannot ferment safely.
Why Small Tastes Are Still a No
Owners often meet this list with a memory of a rabbit who once ate something forbidden and seemed fine. Survival is not safety. Gut disruption in rabbits can build quietly, with eating slowing and droppings shrinking hours after the food itself, and a rabbit who stops eating is already in serious trouble. Toxic exposures add their own timeline on top of that, and signs do not always match the dose in a way an owner can judge at home.
So the household rule is simple and absolute: these foods are not stored where the rabbit roams, not offered by visitors, not given to children to hand over as treats, and not used up as leftovers in the rabbit's bowl. Put the list on the enclosure or the refrigerator, in plain words, because the person most likely to break it is a kind guest who does not know it exists. Safe affection is easy to redirect: a small piece of a rabbit-safe herb or vegetable from the approved list gives the same moment of hand-feeding without the risk.
If a Rabbit Eats Something on the List
Act promptly rather than watching and hoping. Note what was eaten, roughly how much, and when, and contact a vet promptly for guidance, sooner still if there are signs such as drooling, diarrhea, a swollen or painful belly, teeth grinding, or a rabbit who is unusually quiet or refusing hay. Bring that timing and amount information to the call, because it shapes the vet's advice.
Never induce vomiting unless a vet directs it. Rabbits are physically unable to vomit safely, and attempting it can cause serious harm on top of the original exposure. Do not offer home remedies, extra foods, or medicines to counteract the food either; keep the rabbit calm, keep hay and water available, and follow the vet's instructions. In KinsLe, Care Teams carry the never list into every feeder's task view, so a relief feeder learns the absolute rules before a single bowl is filled.