The best hay for most adult rabbits is timothy hay, offered in unlimited amounts every day. Hay should make up roughly 80% of a rabbit’s diet, and the high fiber content is essential for both digestive health and keeping their continuously growing teeth worn down. Timothy is the gold standard, but orchard grass, oat hay, bromegrass, and meadow hay are all safe options too.
Why Hay Matters So Much
Rabbits aren’t like dogs or cats. Their digestive systems are built to process large volumes of tough, fibrous grasses. In the wild, rabbits eat nutritionally poor, high-silica grasses that naturally grind down their teeth, which never stop growing. Without enough hay, a pet rabbit’s teeth can overgrow and cause painful dental problems.
Fiber also keeps the gut moving. Rabbits produce special droppings called cecotropes, which they re-eat to absorb nutrients. When a rabbit eats too many calorie-dense foods (pellets, treats) and not enough hay, this process breaks down, often resulting in soft, matted droppings. A hay-heavy diet prevents that.
Timothy Hay: The Top Choice
Timothy hay is the most widely recommended hay for adult rabbits. It’s high in fiber, low in protein, and low in calcium, a combination that keeps the digestive tract functioning properly without adding excess weight or stressing the urinary system. You can offer it in unlimited quantities.
Timothy hay comes in three cuts, and the differences matter if your rabbit is picky:
- First cut is mostly thick stems with very few leaves. It has the highest fiber content and the least fat and protein. It’s the toughest to chew, making it great for tooth wear, but some rabbits find it less appealing.
- Second cut has a softer texture with more leaves and fewer stems. It still provides plenty of fiber but is slightly higher in protein and fat. This is the most popular cut for pet rabbits because it balances nutrition with palatability.
- Third cut is the softest, with lots of leaves, few stems, and no flower heads. It has the least fiber and the most fat and protein of the three. It works well for tempting a rabbit who refuses other hay, but ideally shouldn’t be the only cut offered long-term.
Other Grass Hays Worth Trying
You don’t have to stick with one type of hay. Mixing varieties adds texture and flavor, which can encourage a reluctant rabbit to eat more.
Orchard grass has a soft texture and is high in fiber, low in both protein and calcium. It’s a popular alternative for rabbits (or owners) who are allergic to timothy hay, and most rabbits enjoy the taste.
Oat hay is another high-fiber, low-protein option. It has crunchy seed heads that many rabbits love to dig through and munch on. It blends well with timothy or orchard grass.
Bromegrass is a perennial bunch grass that’s high in fiber and supports both dental and intestinal health in adult rabbits. It’s less commonly found in pet stores but works well as part of a hay rotation.
Meadow hay is a mix of naturally occurring grasses, which gives your rabbit a variety of textures and flavors in a single bag. The tradeoff is that protein and calcium levels can vary quite a bit depending on which grasses are in the mix. Because some batches may be richer than straight timothy, you may want to offer it alongside timothy rather than as the sole hay.
Alfalfa Hay: Only for Young Rabbits
Alfalfa is the one hay type that should be limited or completely removed from an adult rabbit’s diet. It’s not a grass hay; it’s a legume, and it’s significantly richer in both protein and calcium. Alfalfa contains roughly 1.5% calcium compared to about 0.5% in grass hay. That extra calcium isn’t just unnecessary for adults, it can contribute to urinary problems.
Rabbits absorb more calcium from food than they actually need and excrete the surplus through urine. A study feeding rabbits legume-heavy diets found they developed more urinary sediment, larger kidneys, and higher urinary calcium levels compared to rabbits on grass hay. Grass hay diets also led to higher water intake, which further helps flush the urinary system. For any rabbit prone to bladder sludge or urinary stones, a grass hay diet is strongly recommended.
Where alfalfa does belong is in the diet of young, growing rabbits and pregnant or nursing mothers, who benefit from the extra protein and calcium during those high-demand life stages. Once a rabbit reaches adulthood (around 6 to 12 months for most breeds), the transition to timothy or another grass hay should be complete.
How Much Hay to Offer
The short answer: unlimited. Hay should be available at all times, not rationed. A common guideline is that a rabbit should eat a body-sized pile of hay each day, though many will eat more. If your rabbit’s hay rack is empty at any point, refill it. Unlike pellets or fresh vegetables, there’s no upper limit on grass hay consumption.
Pellets, fresh leafy greens, and the occasional treat round out the diet, but they’re supporting players. Hay is the foundation. If your rabbit seems uninterested in hay, try switching to a different type or cut before assuming the rabbit just doesn’t like it. A rabbit that ignores coarse first-cut timothy may happily devour soft orchard grass or leafy third-cut timothy.
How to Spot Good Quality Hay
Not all bags of hay are equal, even within the same brand. Fresh, well-harvested hay has a sweet, natural smell you can detect even through sealed packaging. If the hay smells musty or has no aroma at all, skip it. A musty smell can indicate mold, which is genuinely dangerous for rabbits.
Color is another reliable indicator. Good hay has the kind of green you’d expect to see in a field. Hay that looks bleached, yellowish, or brown has likely been over-cured in the sun, sat in storage too long, or been exposed to moisture during harvest. It’s not necessarily harmful, but it’s lost nutritional value and your rabbit will probably be less enthusiastic about eating it. Dusty packaging is another red flag that the product has been sitting on the shelf for a while.
Once you get hay home, store it in a cool, dry place with good airflow. Sealed plastic containers can trap moisture and promote mold. A cloth bag, open box, or paper bag in a dry room works better. Even premium hay gradually loses its aroma and appeal over time, so buying in quantities your rabbit will consume within a few weeks keeps things fresh.