Broccoli is safe, with one species-specific catch
Broccoli is not toxic to rabbits, and plenty of rabbits eat florets happily for years. The caution attached to it is about fermentation. Broccoli is a brassica — kin to cabbage and sprouts — and brassicas produce more gas as they are digested than most vegetables do. In a dog or a person that is a minor discomfort with obvious exits. A rabbit's digestive tract is a one-way system that cannot burp or vomit, so gas has to travel the whole length of the gut, and a gassy rabbit is an uncomfortable rabbit whose appetite can switch off — the first step on the road to gut stasis, the condition rabbit keepers rightly fear.
That is why broccoli advice is always 'start small and observe' rather than a plain yes. The food is fine; the individual rabbit decides.
The one-floret test
Offer a single small floret — florets and leaves are the best-tolerated parts; the thick stalk is the most fibrous and gassy — then wait a full day and read the evidence. Evidence of a pass: droppings normal in size and number, the rabbit eating hay with enthusiasm, moving about, and behaving like itself. Evidence of a fail: a hunched, quiet rabbit pressing its belly to the floor, refusing food, producing few or small droppings, or a stomach that feels tight and sounds gurgly when you listen closely.
A rabbit that passes can graduate to a floret or two a few times a week inside the mixed greens, always raw and washed — cooking softens broccoli into a form a rabbit's gut is not designed for, and it should never be served cooked, seasoned, or from your own plate. A rabbit that fails the test comes off broccoli permanently, and that is no loss: the greens list is long, and no rabbit needs this particular one.
If gas signs appear
A rabbit showing the fail signs above is a rabbit to act for, not to watch indefinitely. Encourage movement, offer hay and water, keep it warm and unstressed, and if eating has stopped or the rabbit is clearly in pain — teeth grinding, restlessness shifting position — the vet visit is the same day, urgently. Gut slowdown in rabbits escalates in hours, not days. Never offer human digestive remedies or any medication from your own cabinet; rabbit-safe treatment is a vet's call.
This is also why broccoli should never be a brand-new food offered the night before you travel or hand over care. New foods are introduced when you are home to watch the outcome, one at a time, so you know exactly which food produced which response.
Placing broccoli in the rotation
Keep broccoli as an occasional rotation member even for rabbits that tolerate it — the daily greens are better built on lettuces, herbs, and pepper, with a floret appearing a couple of times a week for variety. Variety itself is protective: a rabbit eating six different greens across a week is far less likely to be overwhelmed by any one of them than a rabbit served a bowl of broccoli alone.
Because the verdict differs per rabbit, the instruction has to live with the individual animal, and that is where KinsLe's Care Teams earns its place: the feeding duty on each rabbit's profile can carry a plain note — broccoli cleared, or broccoli never — so nobody experiments with the wrong rabbit.