How often should you feed a guinea pig?
Feeding a guinea pig is mostly a question of getting two things right: how often, and how much. Unlimited hay at all times, a small daily portion of pellets, and fresh greens once a day. That rhythm changes with age, so treat the sections below as your starting point and then adjust to the individual animal in front of you.
How often to feed a guinea pig
Unlimited hay at all times, a small daily portion of pellets, and fresh greens once a day.
Short answer: Unlimited hay at all times, a small daily portion of pellets, and fresh greens once a day.
How much to feed
About 1/8 cup of plain pellets per adult per day, plus roughly a cup of fresh greens each.
Getting it right in practice
- Timothy or orchard grass hay must always be available — it wears down their continuously growing teeth.
- Guinea pigs cannot make vitamin C and need it daily: bell pepper, kale and a vitamin C supplement if your vet advises.
- Fresh greens every day; introduce new ones slowly.
- Never feed iceberg lettuce as a staple, and avoid anything in the onion family.
How feeding changes with age
Young (0–6 months)
Higher protein needs (alfalfa hay often recommended), rapid growth, early handling to build trust.
Adult (6 months–4 years)
Timothy-based diet, stable weight, regular companionship.
Senior (4+ years)
More frequent weighing, easier cage access, softer bedding, watch for mobility and teeth issues.
Common feeding mistakes
- Eyeballing portions. Measure with a cup or a scale for the first month at least — most owners underestimate how much a guinea pig actually eats.
- Switching food too fast. Change over 7–10 days, increasing the new food gradually.
- Reading the wrong life stage. Feed unlimited hay at all times, a small daily portion of pellets, and fresh greens once a day. for the age your animal is now, not the age it was when you got it.
- Ignoring body condition. Weight is the clearest signal you have. Weigh monthly and adjust portions before the weight becomes a problem.
Related questions
How big should a guinea pig cage be?
Around 7.5 sq ft for a pair (roughly 30×36 inches), and more for three or four. Floor area matters more than height, and solid flooring protects their feet.
Do guinea pigs really need a friend?
Yes. They are highly social and a lone guinea pig is typically less active and less healthy. Same-sex pairs or a neutered male with females are the usual combinations.
How often should I clean the cage?
Spot-clean wet spots daily and do a full bedding change once or twice a week. Daily spot cleaning is what actually controls smell.
Not veterinary advice. This guide covers husbandry. If your guinea pig is injured, off food unusually long, or behaving abnormally, contact a veterinarian.