Hay first, and a lot of it
A Flemish Giant is a rabbit built at dog scale, and his daily eating starts with grass hay available at all hours — timothy, meadow, or orchard grass, refreshed at least morning and evening. Owners of smaller breeds can get away with a stuffed hay rack lasting a day; a Giant works through that rack by midday and then sits with nothing to chew, which is exactly what his gut and teeth cannot afford. Rabbits are designed to graze almost continuously, and a steady flow of long fibre keeps the digestive tract moving and grinds down teeth that never stop growing.
Serve hay in a rack or a clean litter-area pile, since rabbits happily eat while they toilet, and top it up with fresh, sweet-smelling handfuls rather than leaving yesterday's picked-over stems. If he is scattering more than he eats, check the hay quality before blaming him — dusty, musty bales get rejected by rabbits of every size.
Greens and pellets for a large frame
On top of hay, give a generous double handful of leafy greens daily: romaine, spring greens, kale, coriander, and dandelion leaves from a safe source rotate well. Introduce any new green in a small amount first and watch the droppings over the following day. A Giant needs more greens than a dwarf breed, but the ramp-up rule still applies, because a sudden bowlful of rich leaves can soften stools in any rabbit.
Pellets stay measured even at this size. An egg-cup measure per kilo of body weight is a common working guide for an adult, split across the day, using a plain high-fibre pellet rather than a muesli mix he can sort through. It is tempting to feed a giant rabbit giant pellet portions, but excess pellets are the fastest route to a Giant who ignores his hay — and hay, not pellets, protects his gut. Growing youngsters, pregnant does, and rabbits living outdoors in cold weather may need more, adjusted gradually.
Water a big rabbit cannot knock over
A Flemish Giant drinks substantially, and a standard small bottle may empty or frustrate him. A heavy ceramic bowl he cannot tip, rinsed and refilled daily — twice in warm weather — usually serves him better, with a bottle as backup if he is a bowl-dipper who soils the water with hay. Whatever the vessel, check it at every hay refill.
Watching output in a giant breed
His droppings tell the daily story: plentiful, round, dry droppings mean the fibre engine is working, while shrinking, sparse, or strung-together droppings mean he needs more hay, more movement, and, if output stalls or he stops eating, a veterinarian the same day, because gut slowdown is an emergency in rabbits. Weight is the slower signal — a Giant should feel solid and muscled over the ribs, not padded, and a monthly weigh-in on bathroom scales, holding him securely, catches creep before it loads his hocks and joints.
Sore hocks, a known weak point in heavy rabbits, connect back to feeding: an overweight Giant on hard flooring suffers twice over, so keep the pellets honest and the hay endless.
Because everything about this rabbit is a two-person workload, KinsLe's Care Teams lets the household split hay refills, greens, and bowl washing into named duties, each ticked off with a time so the next person knows the Giant has already been served.