Bringing home a Guinea pig is exciting, and you want to make sure they get the best care. At Calistoga Pet Clinic in Napa County, we help owners care for their Guinea pigs every day. Many new owners don’t realize how complex Guinea pig needs can be. Around 60% of pet Guinea pigs develop preventable health issues from poor diet or housing. With the right information, your Guinea pig can enjoy a happy life for five to seven years or longer.

Guinea pigs, also called cavies, are social and smart. They use sounds to communicate and often form close bonds with their owners. Even though they are small, they are not low-maintenance pets. Understanding their diet, housing, and health needs helps them thrive.

Guinea Pig Nutrition: Getting the Diet Right

Diet is very important for Guinea pig health. Guinea pigs are herbivores with special nutritional needs that are different from other small pets like hamsters or rabbits. If their diet is not right, they can develop serious or even fatal problems such as scurvy, obesity, dental disease, and digestive issues.

Fresh Hay: The Foundation of Guinea Pig Diet

Make sure your Guinea pig always has plenty of fresh grass hay. This should make up about 80% of their diet. Timothy hay is the best choice, but orchard grass, meadow hay, or other grass hays are also good. Hay gives them fiber for digestion, helps keep their teeth healthy, and keeps them busy as they forage.

Do not give adult Guinea pigs alfalfa hay instead of grass hay. Only Guinea pigs under six months old should have alfalfa. For adults, alfalfa has too much calcium and protein, which can cause bladder stones and obesity. Always keep hay fresh and dry, and replace it every day to keep it tasty and free from mold.

A lot of owners don’t realize how much hay Guinea pigs need. Your Guinea pig should always have a pile of hay about the size of their body. Since they eat throughout the day and night, make sure they always have access. Store hay in a cool, dry place and check it often to make sure it’s still good.

Vitamin C: An Absolute Requirement

Guinea pigs cannot make their own vitamin C, so they need it in their diet. Without enough vitamin C, they can quickly get scurvy, which causes joint pain, slow healing, and can even be fatal. Adult Guinea pigs need about 10 to 30 mg of vitamin C each day, and pregnant or growing Guinea pigs need even more.

Fresh vegetables high in vitamin C should be offered daily. Excellent choices include bell peppers (especially red), kale, parsley, cilantro, dandelion greens, and broccoli. One-quarter to one cup of fresh vegetables per Guinea pig daily provides important nutrients, including vitamin C. Rotate vegetable types to provide variety and ensure balanced nutrition.

Good quality Guinea pig pellets with added vitamin C can help, but vitamin C in pellets breaks down quickly—about half is lost within 90 days after they are made. Buy small bags you can use in a month or two, keep them in a cool, dark, dry place, and always check the expiration date. Give each adult Guinea pig about one-eighth cup of pellets daily.

Foods to Offer and Foods to Avoid

Safe vegetables for Guinea pigs are romaine lettuce (but not iceberg), a little spinach, cucumber, zucchini, carrots, and tomatoes. Only give fruit as a small treat now and then because of the sugar. Small pieces of apple, strawberry, or melon once or twice a week are okay. Never give Guinea pigs iceberg lettuce, onions, garlic, potatoes, rhubarb, or avocado, as these are toxic and can make them very sick.

Do not give your Guinea pig store-bought treats with seeds, nuts, dried fruit, or yogurt drops. These are unhealthy, can upset their stomach, and may cause obesity. The best treats are small amounts of their favorite vegetables. You can also give them fresh grass from areas without pesticides, but only once in a while.

Introduce new foods to your Guinea pig slowly. Give only one new vegetable at a time and wait a few days to see if they tolerate it before adding another. Sudden changes in diet can cause serious digestive problems.

Creating the Perfect Guinea Pig Habitat

Guinea pigs need the right housing for both their bodies and minds. Most cages sold in pet stores are too small. For one or two Guinea pigs, you need at least 7.5 square feet of floor space, but 10.5 square feet is even better. When it comes to Guinea pig cages, bigger is always better.

C&C cages (cube). Many experienced Guinea pig owners use C&C cages, which are made from cubes and coroplast. These cages can be built to any size, are easy to clean, have great airflow, and usually cost less than store-bought cages, while giving your pets more room. You can also use large dog exercise pens or build your own enclosure. 

Guinea pig cages need solid flooring with proper bedding. Fleece liners are washable and soft. Paper-based bedding is also good. Avoid cedar or pine shavings—these can harm Guinea pig lungs. Aspen shavings are safe if you prefer wood.

Give your Guinea pig several places to hide so they feel safe. Cardboard boxes, store-bought hideouts, or tunnels all work. Each Guinea pig should have their own hiding spot to avoid fights. Add things like hay racks, tunnels, ramps, and safe chew toys to keep them busy and happy.

Social Needs: Guinea Pigs Need Companions

Guinea pigs are very social and get lonely if kept alone. In the wild, they live in groups. A single Guinea pig may develop behavior problems and not live as long. It’s best to keep at least two Guinea pigs together.

You can pair two females, two neutered males, or a neutered male with one or more females. Un-neutered males often fight, especially if there are females nearby. To avoid the stress of introducing new Guinea pigs, consider adopting a bonded pair from a rescue.

Introducing new Guinea pigs takes patience. Never just put two unfamiliar Guinea pigs together. Instead, introduce them in a neutral space, let them meet slowly under supervision, and watch for good signs like nose-touching and calm behavior instead of fighting or chasing. This process can take anywhere from a few days to a few weeks, depending on the Guinea pigs.

Some Guinea pigs simply won’t accept cage mates. Some Guinea pigs just won’t get along with others, no matter what you try. If this happens, keep them in separate cages next to each other so they can see and smell each other but not touch. Never force Guinea pigs that don’t get along to share a cage, as this can lead to serious injuries. Guinea  pigs can develop health issues. Knowing common problems helps you recognize symptoms early when treatment is most effective. Guinea pigs are prey animals who hide illness until they’re very sick, so subtle changes often signal serious problems.

Respiratory Infections

Guinea pigs often get upper respiratory infections, usually caused by bacteria like Bordetella and Streptococcus. Signs include sneezing, runny nose, trouble breathing, tiredness, and not eating. These infections can quickly turn into pneumonia, which can be deadly. If you notice any breathing problems, take your Guinea pig to the vet right away.

Bad air flow in the cage, dusty bedding, changes in temperature, and stress can all make respiratory infections more likely. Keep your Guinea pig’s home clean and dry with good air flow. Try to keep the temperature steady between 65 and 75 degrees Fahrenheit, and avoid drafts or sudden changes.

Dental Disease

Guinea pig teeth never stop growing—they grow about 7 to 8 millimeters each month. Eating hay helps wear their teeth down to the right length. If their teeth get too long or crooked, they can’t eat well and might even starve. Watch for drooling, trouble eating, weight loss, or only eating soft foods.

If your Guinea pig has dental problems, a vet will need to file or trim their teeth, usually under anesthesia. Giving them unlimited grass hay helps prevent most dental issues. Regular checkups with your vet can catch dental problems early.

Bladder Stones

Guinea pigs can get bladder stones if they eat too much calcium from alfalfa hay or certain vegetables. Signs include blood in the urine, peeing often or with pain, or making noises when urinating. Bladder stones need surgery and can be deadly if they block urine flow. enough water, and limit high-calcium veggies to help prevent stones. Genetics can play a role, too. Regular checks and prompt veterinary care for urinary symptoms improve outcomes.

Vitamin C Deficiency (Scurvy)

As mentioned before, Guinea pigs can’t make their own vitamin C and need it in their diet. Without enough vitamin C, they can get scurvy in just a few weeks. Signs include not wanting to move, painful or swollen joints, not eating, a rough coat, and slow healing. If untreated, scurvy can be fatal.

Preventing scurvy is simple: give your Guinea pig fresh vegetables high in vitamin C every day, use good pellets with vitamin C, and consider supplements if your Guinea pig doesn’t like veggies. Some people add liquid vitamin C to water, but it breaks down quickly and can make the water taste bad, so your Guinea pig might drink less.

Grooming and General Care

Guinea pigs need regular grooming based on their coat type. Short-haired Guinea pigs should be brushed once a week to remove loose fur. Long-haired breeds, like Peruvians, need daily brushing to prevent mats and tangles. Some long-haired Guinea pigs also need regular trims to keep their fur easy to manage.

Trim your Guinea pig’s nails every four to six weeks. If nails get too long, they can curl and hurt your pet’s feet. Use small animal nail clippers and only trim the sharp tip, being careful not to cut the quick (the blood vessel inside the nail). If you’re not comfortable doing this yourself, your Sonoma County vet or groomer can help.

Check your Guinea pig’s ears, eyes, and nose regularly for discharge, redness, or swelling. Examine the bottom of the feet for any sores or injuries. Weigh your Guinea pig weekly, as weight loss often indicates illness before other symptoms appear. Adult Guinea pigs typically weigh 1.5 to 3 pounds, depending on sex and breed.

You usually don’t need to bathe your Guinea pig unless they are very dirty or have long hair that gets soiled. If you do need to bathe them, use lukewarm water and a small animal shampoo, rinse well, and dry them completely so they don’t get cold. Most Guinea pigs find baths stressful, so only bathe them when it’s really needed.

Veterinary Care for Guinea Pigs

It’s important to find a vet who knows how to care for Guinea pigs. Not all vets treat exotic pets, and Guinea pigs have special medical needs. Set up care with an experienced vet before any problems come up, so you have someone to call in an emergency. Your Napa County vet clinic can tell you if they have Guinea pig experience or can refer you to a specialist.

Yearly checkups help catch health problems early. Your vet will look at your Guinea pig’s weight, teeth, eyes, ears, heart, lungs, and overall health. They can also trim nails and answer any questions about diet or behavior. Preventive care is much easier and cheaper than treating serious illness.

Some emergencies need a vet right away, such as trouble breathing, not being able to eat or drink, not eating for more than 12 hours, not being able to pee or poop, seizures, extreme tiredness, or bleeding. Guinea pigs can get much worse in just a few hours when they are very sick, so don’t wait to get help.

Cavy lovers’ site Guinea Piggles has a good article on Guinea Pig behavior, which you can find here. The Royal Society For The Prevention Of Cruelty to Animals has an article on cavies, which is here. 

FAQ About Guinea Pig Care

How much does it cost to care for Guinea pigs properly?

To set up for two Guinea pigs, you’ll need a good-sized cage ($50 to $200), water bottles, food dishes, hiding spots, and starter food and bedding, which adds up to about $150 to $300. Each month, expect to spend $55 to $110 on hay, pellets, fresh vegetables, and bedding. Yearly vet exams cost $50 to $100 per Guinea pig. Emergency vet care can be expensive, sometimes costing hundreds or even thousands of dollars, so owning Guinea pigs is a big commitment.

Can Guinea pigs live alone, or do they need companions?

Guinea pigs are very social and do best with a friend. A single Guinea pig can get lonely, sad, and may develop behavior problems or not live as long. Spending time with your Guinea pig helps, but it’s not the same as having another Guinea pig around all the time. Most rescues and exotic vets recommend keeping Guinea pigs in pairs or small groups. If you can only have one, be ready to spend a lot of time with them and give them plenty of things to do.

What’s the difference between Guinea pig care and rabbit care?

Guinea pigs and rabbits are both herbivores, but they have very different needs. Guinea pigs need extra vitamin C, but rabbits make their own. Guinea pigs can live in smaller spaces but should not be kept alone, while rabbits need much more room and can live by themselves. Guinea pigs are usually more talkative and social with people. They also eat more vegetables for their size than rabbits do. Never keep Guinea pigs and rabbits together, as rabbits can hurt Guinea pigs and may carry bacteria that are dangerous for them.

How do I know if my Guinea pig is sick?

Small changes can be signs that your Guinea pig is sick. Look for eating less or not eating at all, being less active, drinking less, fewer or no droppings, trouble breathing, discharge from the eyes or nose, weight loss, hiding more, a rough coat, a hunched back, or not wanting to move. Since Guinea pigs hide illness, any change in behavior should be watched closely, and you may need to call your vet. If you’re not sure, contact your vet early—quick action can make a big difference.

Visit Our Napa County Vets for Guinea Pig Care

Caring for Guinea pigs properly requires commitment, knowledge, and attention to detail. Taking good care of Guinea pigs takes time, knowledge, and attention, but it’s very rewarding. These gentle, social pets bring a lot of joy and companionship to families who meet their needs. Giving them plenty of hay and vitamin C, a roomy home, and a friend all help keep your Guinea pig healthy and happy, Calistoga Pet Clinic welcomes these special pocket pets. We provide wellness exams, dental care, and treatment for illnesses and injuries. Schedule an appointment today and let’s make sure your Guinea pig receives the excellent care they deserve for a long, healthy life.

This blog is intended solely for informational purposes. Always consult with your veterinarian for proper medical advice, diagnosis, or treatment plan for your pet and follow their guidance.

If you want to learn more about our Napa County, CA pet clinic, visit our Service page here for an overview of our services. If you are a new customer bringing your pet in for wellness care, fill out a triage form here.