By Dr Duncan Houston
A hay rack can look full even when very little is being eaten. What matters is regular chewing, normal droppings and a stable body weight, not simply placing hay in the enclosure.
For rabbits and guinea pigs, hay is daily food as well as an opportunity to forage.
Quick Answer
Healthy rabbits and guinea pigs should have continuous access to fresh, suitable hay, usually grass hay for adults. A loose bundle roughly the animal’s body size is a practical starting amount to offer each day, not a strict intake target or a maximum. Refresh and top up as needed, and seek prompt veterinary advice if hay eating drops, especially with smaller or fewer droppings.
Why hay is different from a bowl of pellets
Long fibrous strands encourage prolonged chewing and support normal gut function. Pellets are more concentrated and can crowd out hay when overfed. Hay supports dental wear, but cannot guarantee freedom from dental disease or correct teeth that are already abnormal.
The RSPCA’s rabbit feeding guidance places hay and grass at the centre of the diet and recommends investigating reluctance to eat them.
Which hay should you choose?
| Hay | Useful considerations |
|---|---|
| Timothy, orchard grass or suitable meadow hay | Common adult staples. Try different clean batches and textures if preference varies. |
| Oat hay | Can provide variety; avoid letting an animal pick only seed heads. |
| Lucerne or alfalfa | A legume hay with different protein, calcium and energy levels. Often used for growth or specific needs rather than as the default for healthy adults. |
| Dusty, damp, musty or visibly mouldy hay | Discard it. Do not mix a poor batch into fresh hay. |
Straw is primarily bedding and is not an adequate substitute for feeding hay. Fresh safe grass can be valuable when introduced gradually; lawnmower clippings are unsuitable because they can heat and ferment quickly.
How to tell whether enough is being eaten
Watch each animal chew hay daily. Replace soiled portions, notice how much fresh hay disappears, and check droppings at routine morning and evening care. In shared housing, provide more than one feeding point so a confident companion cannot block access.
Regular weighing helps separate apparent enthusiasm from adequate nutrition. Weight loss, persistent changes in droppings or leaving coarse strands while taking only soft foods needs a veterinary review.
What if hay eating suddenly decreases?
Check freshness and access, but do not assume fussiness. Dental pain, illness, stress, dehydration and abdominal discomfort can reduce intake. A guinea pig also needs reliable vitamin C alongside its hay-based diet; hay alone is not a complete feeding plan.
When is this an emergency?
Contact a vet immediately if a rabbit or guinea pig eats markedly less or stops passing its usual droppings. A swollen painful abdomen, severe weakness or collapse requires emergency care. Do not wait overnight to see whether a new hay flavour solves the problem, or force-feed a painful bloated animal without advice.
A practical hay routine
- Offer fresh hay at floor level or in a safe, accessible rack without trapping gaps.
- Place some near a preferred resting or toileting area, while keeping it clean and dry.
- Refresh small appealing piles throughout routine care rather than leaving one stale heap.
- Review pellet and treat portions if a healthy animal consistently ignores hay.
- Keep a record of weight and appetite, and bring the full diet history to your vet.
Common mistakes
- Restricting hay because a pet is overweight.
- Assuming expensive hay is always fresher.
- Replacing refused hay with unlimited pellets without investigating the reason.
- Using a deep container that an older or painful animal cannot reach.
Use hay for safe enrichment
Offer easy hay-filled boxes or several open piles for exploration, without strings or narrow openings. Preserve a straightforward feeding area alongside new activities. A predictable routine, room to move and reduced competition make healthy eating easier.
Frequently asked questions
Is a body-sized pile the maximum?
No. It is a visual starting point. Hay should remain available and be refreshed when soiled.
Can pellets replace hay?
Not for routine healthy feeding. Animals unable to chew need an individual veterinary feeding plan.
Should I remove hay at night?
No. Rabbits and guinea pigs eat at multiple times, including when you are asleep.
Can I change hay types?
Usually, but introduce changes gradually and monitor intake. Avoid making several dietary changes at once.
Keep suitable hay available, but judge success by the animal in front of you. A change in chewing or droppings is more useful than the size of the pile.
For help making sense of your animal’s care needs, explore ASK A VET™. Contact your veterinarian directly for urgent concerns.
The ASK A VET™ Tracker logs live location and activity trends, so a change in routine never goes unnoticed.
- Guinea Pigs
- Hay
- Nutrition
- Rabbits
Every ASK A VET article is written and reviewed by qualified veterinarians.
