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Diet Guide 2026

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Expert Insight: This guide provides expert, science-backed insights into Diet requirements for Guinea-pigs, updated with the latest 2026 veterinary care standards.

Guinea pigs (Cavies) are special because, just like us, they can't make their own Vitamin C. This means what they eat is the most important part of keeping them healthy and happy. The best way to feed your guinea pigs is with lots of fresh hay, plenty of Vitamin C from fresh veggies, and clean water. This guide shows you exactly how to feed your guinea pigs so they stay healthy and active.

1. The Vitamin C Secret: Fresh is Best

Vitamin C is vital for guinea pigs, but it disappears quickly from food when exposed to light and air. This means you can't just rely on store-bought pellets to keep them healthy. Without enough Vitamin C, guinea pigs can get very sick, with sore joints and a weak immune system.

  • The Best Sources: Fresh bell peppers (red, yellow, or green) are the best way to give your pigs the Vitamin C they need. One slice per pig every day is perfect.
  • Skip the Water Drops: Experts recommend staying away from Vitamin C drops that you put in their water. The Vitamin C disappears too fast to work well, and it can make the water taste funny, which might stop your pigs from drinking enough.

2. Unlimited Hay: The Tummy Engine

Hay is the most important part of a guinea pig's life. They need to be able to eat it all day long to keep their tummy moving and to keep their teeth from growing too long.

  • Timothy and Orchard Grass: These are the best choices for adult pigs (over 6 months old).
  • Alfalfa Hay: This is very rich and is great for growing babies or nursing moms, but it has too much calcium for adult pigs and can cause health issues like bladder stones.

🛡️ Keeping Their Bladders Healthy

Guinea pigs are naturally prone to getting bladder stones if they have too much calcium. To keep them healthy:

  • Watch the Veggies: Don't feed too much kale, spinach, or parsley, as these are very high in calcium.
  • Fresh Water Always: Make sure they always have plenty of clean water in their home to help keep their system flushed and healthy.

3. The Daily Salad: Fresh Veggie Fun

Fresh vegetables should be a small but fun part of their day (about 10-15%). Focus on leafy greens that give them variety without too much sugar or calcium.

  • Daily Favorites: Green and red leaf lettuce, cilantro, and bell peppers are great every day.
  • Special Treats: Small bits of carrots, berries, or apples (without seeds) are great for making friends with your pet, but they should only be a tiny part of their diet.

4. Pellets and Water

Give them a small amount of high-quality Timothy pellets (about 1/8 cup) each day. Look for "plain" pellets without seeds, nuts, or colorful bits, which aren't healthy for them.

Guinea Pig Food Safety Checker

Wondering if your Guinea Pig can eat a specific fruit or vegetable? Click below for our detailed safety guides:

Note: Always introduce new foods slowly and monitor your pet for any changes in behavior or digestion.

Conclusion: A Happy, Healthy Piggy

Great food is the best gift you can give your guinea pigs. By making sure they have plenty of hay and Vitamin C, you are helping them stay happy, vocal, and full of life. Check out our habitat guide for tips on their home. If your pig seems tired or stops eating, check our symptom checker right away.