The body-sized pile rule
Start with availability, not portions. Hay belongs within reach at all hours, in generous heaps that invite grazing whenever your rabbit wants to chew, topped up well before the last clean strands vanish. Across a full day that steady grazing adds up to a substantial total, roughly matching your rabbit's own bulk, which is why a modest rack emptied by morning falls short even when it looked ample at filling time. Think of the daily total as the target and constant access as the method, not a single serving handed over at set times.
Why rabbits need that volume of forage
Hay is doing heavy work at that quantity. The long fibres drive the wave-like gut movements that push food through a rabbit's digestive system and produce the steady stream of dry round droppings you want to see. The chewing itself, side to side for hours a day, grinds down teeth that grow continuously — a rabbit eating too little hay is an animal whose teeth are outpacing their wear. Grazing also occupies a rabbit mentally; a foraging animal with an endless pile has a job, while one with an empty rack by midday has nothing to do but wait, and bored rabbits develop habits you would rather they did not.
Making a body-sized amount realistic at home
Serve hay in several places so it is never more than a few hops away: a generous pile in or beside the litter tray, where rabbits happily graze while they toilet, a filled hay rack or bag at the sleeping area, and a loose pile in the exercise space. Replace soiled or flattened hay daily and add fresh on top of clean leftovers rather than waiting for the supply to run out. Buy hay in quantities that match this appetite — small decorative bags rarely survive the week for a good eater — and store bales or large bags somewhere dry so the quality stays sweet and dust stays low from first handful to last.
Checking intake without weighing every strand
You do not need scales to know whether your rabbit is hitting the mark. Learn what a day's pile looks like when you serve it, then notice what remains at the next refresh: steady disappearance, plentiful dry droppings of a good size, and a rabbit who returns to graze often all say the volume is right. If piles routinely come back untouched, look first at the competition — oversized pellet portions and frequent sugary treats — and at the hay itself, since stale or dusty hay suppresses intake even in a willing rabbit. A few days of deliberate observation tells you far more than any single day's impression, because appetite naturally rises and falls with activity and weather.
The intake changes that mean a vet, quickly
Hay that stops disappearing is one of the earliest warnings a rabbit gives you. A rabbit eating much less hay than usual, producing smaller or fewer droppings, or refusing food altogether is an animal to get seen the same day, because rabbit guts slow dangerously when fibre stops flowing. A gradual drift downward with preference for soft foods points more toward dental discomfort and still deserves a prompt check rather than months of watching. Keep the normal picture clear in your mind, and on the days you are uncertain whether the pile has really shrunk, put a follow-up question to KinsLe's Kimmy; she answers using the KinsLe Answers library.