FaunaHub

Guinea pig · Feeding Small pet care

Guinea Pig Feeding Basics

In short

A guinea pig's diet is based on unlimited grass hay, with daily fresh greens, a small amount of plain pellets, and constant fresh water — plus a reliable dietary source of vitamin C, which guinea pigs cannot make themselves. This page explains the principles, not exact quantities or vitamin C doses, and a guinea pig that stops eating needs a vet urgently.

The basics of a guinea pig diet

  • Grass hay should be available at all times and make up the majority of the diet.
  • Offer a daily variety of suitable fresh greens, introduced gradually.
  • A small amount of plain, guinea-pig-appropriate pellets supports balanced nutrition.
  • Provide a reliable dietary source of vitamin C — ask your veterinarian how best to do this for your guinea pig.
  • Provide constant clean, fresh water; avoid sugary treats and muesli-style mixes.

Feeding checklist

  • Unlimited grass hay available at all times.
  • Daily variety of suitable fresh greens, introduced slowly.
  • A small amount of plain, appropriate pellets.
  • A reliable vitamin C source, confirmed with your vet.
  • Constant clean, fresh water; no sugary treats or muesli mixes.

What not to assume

  • Do not assume pellets alone provide enough vitamin C — confirm an appropriate source with your vet.
  • Do not start or dose vitamin C supplements on your own; ask your veterinarian.
  • Do not assume muesli-style mixes are healthy — they can lead to selective feeding.
  • Do not assume reduced eating is minor — a guinea pig that stops eating is urgent.

When to contact a veterinarian

Appetite and vitamin C are key in guinea pigs.

  • If your guinea pig stops eating or drinking — this is urgent.
  • To confirm how to provide an appropriate vitamin C source for your guinea pig.
  • If there is diarrhoea, weight loss, drooling, or signs of dental trouble.
  • Before any major diet change, especially for a young, pregnant, or unwell guinea pig.

Guinea Pig Feeding Basics — Frequently Asked Questions

How do guinea pigs get vitamin C?
Guinea pigs need a dietary source of vitamin C because they cannot make their own. This can come from appropriate foods and diet. The best approach for your guinea pig should be confirmed with your veterinarian; do not start supplements without guidance.
What should guinea pigs eat most of?
Grass hay should make up the majority of the diet and be available at all times, supporting digestion and dental wear. Fresh greens, a little plain pellet, a vitamin C source, and constant water complete the diet.
My guinea pig stopped eating — is that serious?
Yes. Guinea pigs should eat almost constantly, so a loss of appetite is urgent. Contact a guinea-pig-savvy veterinarian promptly rather than waiting or trying home remedies.

Sources and further reading

Authoritative references used for general educational context. External links open in a new tab and these organisations do not endorse FaunaHub. Housing, diet, and care needs vary by species, age, health, and local climate, and welfare recommendations differ by country and organisation — confirm specifics with a qualified small-animal or exotic-pet veterinarian.