Yes — a guinea pig that has stopped eating is an emergency. Like rabbits, guinea pigs must eat almost constantly to keep their gut moving; when eating stops, the gut can slow and shut down (GI stasis) within hours, which is painful and can be fatal. If your guinea pig has eaten little or nothing for 10–12 hours, or has stopped passing droppings, contact an emergency or exotic vet now — do not wait overnight.
## Why this can't wait Guinea pigs are hindgut fermenters with a gut that needs continuous fibre to keep working. Pain, dental disease, a low-fibre diet, stress, or illness can make a guinea pig stop eating, and once it does, the gut slows, gas builds, and the animal feels worse and eats even less. Because guinea pigs hide illness, by the time you notice, it's often urgent.
## Common reasons a guinea pig stops eating - Dental disease — overgrown back teeth, a very common cause; often with drooling. - GI stasis from any pain, stress, or illness. - Vitamin C deficiency (scurvy) — guinea pigs cannot make their own vitamin C. - Pain elsewhere, a bladder stone, or a respiratory infection.
## What to do now Offer favourite fresh greens, grass, and hay to tempt eating, and make sure water is available. But don't delay veterinary care to keep trying — a guinea pig off its food needs pain relief, fluids, gut-support medication, and often syringe feeding, started as soon as possible.
Get to a vet immediately if you see any of these
- No food AND no droppings for 8–12 hours
- A bloated or hard belly
- Hunched, still, and grinding teeth (pain)
- Not eating with laboured breathing
- Not eating with drooling or a wet chin (dental pain)
Common questions
How long can a guinea pig safely go without eating?
Not long — like rabbits, guinea pigs need to eat almost continuously. More than about half a day without food is a veterinary concern and a full day is an emergency.
Could it just be fussiness?
A healthy, hungry guinea pig eats. Sudden refusal of favourite foods signals pain or illness (often dental), not fussiness — have it checked promptly.
What is scurvy and could it cause this?
Guinea pigs can't produce vitamin C, so a deficiency (scurvy) causes weakness, sore joints, poor appetite, and slow healing. A vet can confirm it and supplement; always provide vitamin-C-rich foods or supplements.
Sources
This page is general guidance, not veterinary advice, and cannot diagnose your pet. It does not replace an examination by a licensed veterinarian. When in doubt, treat it as an emergency and contact a vet or your nearest 24/7 emergency clinic right away.
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