Guinea Pig Care Guide

If you’d told me a few years ago that my entire life would revolve around four tiny potatoes with legs, I would have laughed — and then immediately asked to hold one. I’m Alexandria, exotic veterinary assistant in San Francisco and full-time servant to my guinea pigs Milo, Luca, Coco, and Kai. I wrote this guide because I remember how overwhelming it felt when I first started out, and I want to save you from some of the most common mistakes I see new guinea pig owners make.

Think of this as your home base for guinea pig care. I’ve linked to deeper articles throughout so you can dive into whatever topic you need most. But grab a snack first — this is the good stuff.

Why Guinea Pigs Make Great Pets

Honestly? Guinea pigs ruined me for every other pet. There’s nothing like walking into the room and hearing four little voices screaming at you because they heard you open the fridge. (Milo is the loudest. He has zero chill when it comes to vegetables.) They’re social, goofy, and packed with so much personality that you’ll catch yourself talking about them like they’re your kids — because they basically are.

Milo heard a plastic bag from three rooms away. He’s ready.

With a lifespan of 5 to 7 years, guinea pigs stick around way longer than hamsters or gerbils, which means you actually build a real bond with them. Luca didn’t trust me for the first month, and now he falls asleep in my lap during movie nights. That kind of thing doesn’t happen overnight — it’s earned, and it’s worth it.

They’re gentle enough for families with kids (as long as the kids learn proper handling), but I’ll be real with you: guinea pigs are not a “starter pet.” They need daily fresh food, regular cage cleaning, an exotic-trained vet, and a companion of their own species. If that sounds like a lot, it is — but if you’re ready for it, they’ll pay you back a hundred times over in wheeks and popcorns.

Housing & Cage Setup

This is the one thing I see new guinea pig owners get wrong the most. Those colorful cages at pet stores? Way too small. Your guinea pigs will let you know it, too.

For a pair of guinea pigs, you need a minimum of 10.5 square feet of continuous floor space — and honestly, bigger is always better. My pigs have way more room than that now, and watching them do full-speed zoomies makes it so worth it.

C&C (cubes and coroplast) cages are the gold standard in the guinea pig world. They’re affordable, endlessly customizable, and give your pigs enough room to run, popcorn, and claim their own little territories. You can find quality cage options on our small mammal resources page, including Critter Colony cages.

Inside the cage, you’ll want:

• At least two hides (one per pig, plus an extra — Coco is a hide hog and will claim two if he can)
• A hay rack or hay bag to keep timothy hay off the floor
• A water bottle with a sipper tube (check it daily for clogs)
• A heavy ceramic food bowl for pellets and veggies
• Fleece tunnels or bridges for enrichment

Coco in his favorite hide. Yes, he has three. No, he doesn’t share.

For a complete walkthrough of setting up your first cage, see our cage setup guide.

Bedding: The Foundation of Guinea Pig Health

This is the section where I get a little intense, so bear with me — bedding matters way more than most people realize. Your pigs are sitting on their bedding 24 hours a day. If it traps moisture, harbors bacteria, or kicks up dust, you’re setting them up for real health problems: bumblefoot (painful, swollen foot sores), upper respiratory infections from ammonia and dust, and chronic skin irritation. I’ve seen it happen, and it’s heartbreaking when it’s preventable.

The three main bedding options are paper bedding, wood shavings, and fleece liners. Each has trade-offs, and I’ve written a full breakdown in fleece liners vs disposable bedding. But here’s the quick version:

• Paper bedding (Carefresh) — decent absorption but saturates quickly, creates dust, and runs $20-40/month
• Wood shavings — cheap but risky; pine and cedar contain phenols that damage respiratory tissue; only kiln-dried aspen is considered safe
• Fleece liners — reusable, dust-free, and dry on the surface when properly designed

After years of testing every bedding type with my own pigs and working alongside veterinary teams, I developed the Clinical Series fleece cage liners. They use a medical-grade antimicrobial topsheet, a bamboo absorbent core, and a waterproof base — no layering separate components, no shifting pads, no dust. Just one piece, done.

If you’re dealing with recurring bumblefoot or respiratory issues, bedding is the very first thing I’d look at.

Diet & Nutrition

Good news: feeding guinea pigs is simpler than you’d think. Bad news: getting it wrong can cause serious problems. Let me break it down the way I wish someone had for me.

Timothy hay — this is the main event. About 80% of your pig’s diet should be unlimited timothy hay, available at all times. It keeps their digestive system moving and wears down their continuously growing teeth. Milo practically lives inside his hay pile. I’m convinced he thinks he’s a farmer.

Guinea pig pellets — a small, measured amount daily. Make sure they’re fortified with vitamin C (not rabbit pellets — those lack it!). Small Pet Select is my go-to brand for both hay and pellets.

Fresh vegetables daily — bell peppers are the stars here (especially red and yellow — highest in vitamin C), plus romaine lettuce, cilantro, and leafy greens. Introduce new veggies slowly to avoid tummy trouble. Kai will eat literally anything I put in front of him, but Luca is pickier than a toddler at a restaurant.

Luca basking in the afternoon sun.

Fresh water — always available, changed daily. Non-negotiable.

A critical note on vitamin C: Guinea pigs, like humans, cannot produce their own vitamin C. A deficiency leads to scurvy — symptoms include swollen joints, lethargy, rough coat, and reluctance to move. A diet rich in bell peppers and supplemented with quality pellets usually covers it, but talk to your vet if you’re unsure.

For a deeper look at portions, safe vs unsafe foods, and weekly meal planning, check out our diet and nutrition guide.

Health: What to Watch For

This is probably the most important section in this entire guide, so please don’t skip it. Guinea pigs are prey animals, which means they are hardwired to hide when they feel sick. By the time a guinea pig looks visibly ill, the problem may already be serious. Knowing what to look for early can genuinely save your pig’s life — I’m not being dramatic.

The 5 key health concerns to watch for:

1. Upper respiratory infections (URIs) — wheezing, clicking sounds, nasal discharge, lethargy. This is an emergency. Do not wait.
2. GI stasis — not eating, small or absent droppings, hunched posture. If your pig hasn’t eaten in 12 hours, see a vet immediately.
3. Bumblefoot — swollen, red, or scabbed foot pads, often caused by wet or rough bedding.
4. Dental problems — drooling, dropping food, weight loss. Guinea pig teeth grow continuously and can develop painful spurs.
5. General lethargy — a guinea pig that’s sitting puffed up, not responding to food, or hiding more than usual needs attention right away.

Weigh your guinea pigs weekly. Seriously, a basic kitchen scale is one of the best diagnostic tools you can own. A loss of 50+ grams in a week is a red flag. I weigh all four of mine every Sunday — it takes five minutes and it’s caught issues before they became emergencies.

Most importantly: find an exotic vet before you need one. Not every veterinarian is trained in guinea pig medicine, and you do not want to be scrambling to find one at 10 PM on a Saturday. If you’re in the Bay Area, check our San Francisco exotic veterinarians guide. For a detailed breakdown of warning signs, read 5 signs your guinea pig needs a vet and exotic pet emergency signs.

Socialization & Enrichment

Guinea pigs are herd animals, full stop. They need at least one companion of their own species — a lone guinea pig, no matter how much human attention you give them, is a stressed guinea pig. Same-sex pairs or small groups work best. If you have a boar (male), neutering allows him to live with sows, but two bonded boars can also do great together.

Kai during floor time. He’s the adventurer of the group.

Ways to keep your pigs happy and stimulated:

• Floor time — let your pigs explore a pig-proofed room or playpen daily. Mine lose their minds for it. Kai zooms, Coco hides behind the couch, Milo begs for snacks, and Luca supervises from a safe distance.
• Tunnels and hides — guinea pigs love running through tunnels and having multiple hiding spots to choose from.
• Foraging opportunities — scatter pellets in hay, hide vegetables in paper bags, or use a snuffle mat. It keeps their brains busy!
• Gentle handling — always support your guinea pig’s full body with both hands. Let them come to you rather than chasing them around the cage. Short, positive handling sessions build trust over time.

Milo took three full weeks before he’d willingly climb into my hands. Kai was confident from day one — literally crawled right up my arm during our first meeting. Every pig is different, and patience is everything.

Thinking About Adopting?

If this guide has you excited about bringing guinea pigs into your life — please, please adopt rather than shop. Guinea pig rescues are full of healthy, social animals that desperately need homes. Check your local shelters and rescues first — many even have bonded pairs available, which means the hard work of introductions is already done for you!

What to expect the first week:

• Your new pigs will be scared. That’s completely normal — don’t take it personally.
• Keep the environment quiet, offer plenty of hay and hides, and resist the urge to handle them constantly (I know it’s hard).
• Let them settle in for 2-3 days before starting short handling sessions.
• Watch for signs of stress or illness during the transition.

For a full walkthrough of your first week, adoption checklists, and what supplies to have ready, see our adoption guide.

Need a Guinea Pig Sitter in San Francisco?

If you already have guinea pigs and need someone you can actually trust while you’re away, that’s exactly why I built House of Guineas. I provide specialized exotic pet care — not a dog walker who also watches small animals on the side, but a veterinary-trained caretaker who understands guinea pig health, behavior, and dietary needs. Your pigs deserve someone who gets it.

• In-home pet sitting — I come to your home to care for your pigs in their own environment, keeping stress to a minimum.
• Boarding — your pigs stay with me in a dedicated, climate-controlled space alongside my own herd.

Guinea pig care isn’t rocket science, but it does take intention and consistency. If you have questions, want to explore our small mammal resources, or need to book care for your pigs, I’m here for you. These little animals deserve the absolute best — and with the right setup, they will thrive. Trust me, the wheeks alone make it all worth it.