What Can Guinea Pigs Eat Daily?

An Overview of Guinea Pig Nutrition

As herbivorous animals, guinea pigs have some specific dietary needs. Ensuring your guinea pig’s diet is well-rounded with all the vitamins, minerals, and nutrients required is essential to keeping them healthy and happy.

When it comes to daily nutrition for guinea pigs, there are some key food groups you need to ensure they receive adequate amounts of:

What Can Guinea Pigs Eat Daily


Hay should comprise most of your guinea pig’s diet – around 75%. It provides roughage to promote good dental health and digestive functioning. Timothy hay and meadow hay are common choices.

Fresh Vegetables

Around 20% of diet should comprise of fresh veggies which provide vitamin C, antioxidants, and additional fiber. Leafy greens, peppers, cucumber are good options. Rotate between 3-4 veggies daily.


High-quality guinea pig pellets help supplement key minerals and vitamins not supplied sufficiently from the hay-veg diet alone. Around 2-4 tablespoons per pig daily is ideal.


Fresh filtered water must be available at all times to avoid potentially fatal dehydration. Use heavy, tip-proof bowls.

In the following sections, we’ll dive deeper into different food groups along with portion sizes and feeding frequency guidelines. Let’s start with the base of a guinea pig diet – hay and fresh greens.

Hay for Guinea Pigs

Fresh timothy hay and meadow hay should form the foundation of daily food consumption for guinea pigs after the weaning stage. Plan to offer your adult pig:

  • Unlimited hay supply: Keep hay fully stocked in cage at all times for free feeding
  • More hay options: Rotate between 2-3 hay varieties to add diversity

But why is hay so crucial to a guinea pig’s health? Here are some key reasons:

Promotes Dental Health

The high silica content in hay promotes the wearing down of ever-growing teeth to avoid overgrowth and tooth root problems. Guinea pigs also like to nibble frequently when resting. Unlimited access prevents boredom chewing on cage furnishings.

Digestive Health

The indigestible fiber in hay promotes gut motility and healthy feces formation. This minimizes risks of gastrointestinal issues like gas, diarrhea etc. Common in small critters.


Foraging and nibbling hay satisfies guinea pigs natural grazing behavior. It prevents destructive boredom while providing mental stimulation.

Some hays like oat hay are also enjoyed as treat hays for added enrichment.


In addition to the psychological and dental benefits, hay provides a steady supply of nutrients like:

  • Vitamin C: Fresh hay has more vitamin C than aged hay. Rotating supplies ensures this essential vitamin.
  • Minerals & Vitamins: Calcium, iron, B-vitamins, etc, depending on hay type.
  • Protein and Fiber: For energy, muscle and organ functioning.

Next, let’s look at the best hay varieties to offer guinea pigs on the daily.

Best Hay Types for Guinea Pigs

The three best hays for everyday feeding are:

1. Timothy Hay

Timothy grass hay is the #1 choice for guinea pigs. Benefits include:

  • High protein and calcium
  • Low calories support healthy weight
  • High fiber prevents GI issues
  • Low calcium oxalates unlike alfalfa

It has optimal nutrient levels without excess calories making it suitable as a round-the-clock feeding hay.

2. Orchard Grass Hay

Orchard grass hay has a sweeter taste and tender texture enjoyed by fussy eaters. Benefits:

  • High vitamin C
  • Decent protein and calcium
  • Enticing taste for picky pigs
  • Bright green color stimulates appetite

Its softer stalks also make it easier to chew for elderly pigs with wear or misaligned teeth issues. The vitamin C boost is also useful for pigs recovering from illness.

3. Oat Hay

While not suitable as a primary hay due to higher calories, a handful of oat hay introduces variety. Benefits include:

  • Low silica, high calcium and vitamin D
  • Sweeter, more appetizing taste
  • Nutrient boost for nursing sows
  • Stimulates foraging behaviors

The unique treat appeal makes it helpful in supplementing recovery diets or encouraging disinterested eaters.

In addition to the above top three hays, meadow hay is also suitable for regular feeding, provided it smells fresh and is seed-free. Avoid wheat and alfalfa hays for everyday primary feeding.

Next, let’s discuss how to source, store and serve hay optimally for guinea pig health.

Selecting, Storing and Serving Hay

Here are some tips for choosing, storing and feeding hay:

Choosing Hay

  • Select soft, green hay that smells sweet.
  • Avoid hay with thick stalks or seed heads which can poke eyes.
  • Do not offer moldy, dusty or stale-smelling hay.

Storing Hay

  • Store in cool, dark place in rodent-proof container
  • Air out the bag and fluff up compressed hay before use
  • Throw out extremely soiled hay at bottom that’s been urinated/pooped on

Feeding Hay

  • Dump directly into cage floor or hang hay bag for easy access
  • Change out soiled hay in sleeping areas daily
  • Refill hay in food zone 2-3 times a day
  • Rotate between hay varieties each week

By following these hay handling guidelines, your piggies will enjoy access to fresh appetizing hay at all times to promote optimal dental and gastrointestinal health.

Common Hay Feeding Mistakes

Some common pitfalls seen with guinea pig hay feeding include:

  • Not feeding enough hay
  • Offering only one hay variety forever
  • Allowing hay to run out completely between refills
  • Feeding mouldy/stale hay to save money
  • Pouring hay into bowls instead of directly onto cage floor

Avoiding these issues and providing unlimited fresh hay daily is key to dental and gut health.

Now that we’ve covered the crucial hay guidelines let’s discuss the second key component – fresh vegetables and fruits.

Feeding Vegetables and Fruits to Guinea Pigs

After hay’s 75% portion, around 20% of your guinea pig’s food intake should come from fresh vegetables and occasional fruits.

Leafy greens, red/yellow/orange veggies and high water veggies are especially valuable additions thanks to:

  • Rich vitamin C content
  • Beta-carotenes converted to vitamin A
  • Antioxidants benefits
  • Support hydration and digestion

But moderation is crucial even with healthy veggies to prevent gastrointestinal upsets or weight gain. Here are some veggie feeding tips:

Daily Feeding Guidelines

  • Offer 1 cup chopped veggies per 2 lbs body weight
  • Split into 2-3 feedings instead of one large portion
  • Combine 3-4 veggie types to add diversity
  • Stop feeding if leftovers accumulate to avoid selective feeding

In terms of fruits:

  • Limit to 1-2 times a week, not daily
  • Stick to 1-2 tablespoon serving per pig
  • Berries, melon, kiwi slices are top choices

Next, let’s learn more about the healthiest vegetables for daily guinea pig feeding rotated through the week.

Best Vegetables for Guinea Pigs

The following vegetables check the boxes of being nutritious yet piggy diet-friendly:

Leafy Greens

Romaine lettuce, red/green leaf lettuce, cilantro, kale, parsley, HERB SPRIGS

Benefits: Water content, vitamin C, beta-carotenes

Bell Peppers

Red, yellow, green peppers

Benefits: Vitamin C, Bioflavonoids, Lycopene

Zucchini/Summer Squash

High water content and fiber supports hydration and digestion


Provides water, vitamin K, fluoride


Rich beta-carotenes source

For variation also offer moderate quantities of veggies like broccoli, cabbage, celery, bok choy, snap peas, green beans, tomato etc.

Avoid starchy veggies like potato, sweet potato, corn, beans etc which can cause digestive upset.

Also desist iceberg lettuce which is low in nutrients. Vary selections across supermarket veggie aisles for a diverse vitamin-rich diet.

Vegetable Feeding Mistakes

Some mistakes to avoid with vegetable feeding include:

  • Feeding the same 1-2 veggies daily instead of variety
  • Not accounting for stale veggies or spoiled leftovers
  • Introducing too many new items too quickly
  • Portion distortion – under or overfeeding
  • Adding high sugar fruits like grapes, mangoes etc as everyday foods

Getting the balance right between variety, freshness and right quantities takes some observation but prevents nutrition gaps or weight issues.

Next, talk about pre-formulated guinea pig diets – pelleted feeds and extruded nuggets.

Guinea Pig Pellet and Nugget Foods

The right guinea pig pellets or nuggets help cover potential nutritional gaps in the hay-veg diet. They provide precise supplementation of key minerals, vitamins and proteins vital to health which daily foods may lack, including:

  • Vitamin C
  • Calcium
  • Digestive enzymes
  • Amino acids
  • Vitamin D and E

That being said sole dependence on commercial food is risky due to selective feeding, obesity and dental disease risks. Here are some feeding tips:

Pellets/Nuggets Feeding Guidelines

  • Feed 1/8 cup pellets per pig daily
  • For young/pregnant/nursing pigs – up to 1/4 cup
  • Scatter feed rather than bowl feeding to slow intake
  • Ensure extruded shapes for dental health
  • Avoid sugary seed mixes and yogurt drops

When choosing a brand, read labels to avoid filler ingredients. Also store bags away from heat/moisture and bugs once opened.

Pellet and Nugget Feeding Pitfalls

Here are common pitfalls that can undermine their nutritional purpose:

  • Overfeeding – obesity and selective feeding risks
  • Poor quality brands with corn, seeds, coloring and sugar
  • Stale, bug-infested or humid feed going rancid
  • Allowing access after 24 hours – gorging risks
  • Not crushing malformed pellets, proximity to heaters causing vitamin C breakdown

Getting the right pellets in optimal quantities prevents issues while covering nutritional bases missed by primary diet components.

Feeding Produce to Guinea Pigs

In addition to pellets and nuggets, occasionally feeding small produce pieces provides enrichment. Options include:

Fruit Treats

Apple, pear, melon cubes (1-2 times a week)

Vegetable Starters

Homegrown organic pesticide-free veggie tops/peels – carrot tops, red skin potatoes etc

Leafy Green Scraps

Romaine hearts, broccoli stems, small bruised grocery store herb bunches past prime etc

Rules for Produce Treats

  • Must be fresh – wash, check for bugs/signs of decay
  • Remove any damaged portions
  • Never feed restaurant scraps/leftovers
  • Small bite sized portions – don’t replace regular feeding
  • Stop if soft stool or diarrhea occurs as digestibility varies

While such household produce scraps should never form a dietary staple, as occasional treats they provide enrichment. The stimulation and novelty prevents boredom in prey animals.

Importance of Fresh Water for Guinea Pigs

Access to clean, fresh drinking water is paramount to guinea pig health.

Guinea pigs have a higher water intake need than many mammals due to a concentrate urine adaptation mechanism. Insufficient water risks urolithiasis and organ injury.

General Water Guidelines

  • Use heavy, tip-proof ceramic bowls
  • Refill with filtered water twice daily
  • Wash bowls thoroughly every day
  • Check for signs of trauma around nostrils suggestive of injury from metal ball-bearing sipper tubes

Ideally provide two bowls at opposite cage ends to ensure easy access in groups. Place them away from sleeping zones to contain mess.

In particular, nursing sows, sick pigs and longhaired breeds have increased water needs. Monitor intake and doubling up bowls if needed. Let’s look at two major watering issues:

Dehydration Risks in Guinea Pigs

Guinea pigs hide signs of dehydration till critical stages are reached. Prevention is thus key.

Common risk scenarios

  • Inadequate water provision – empty bowls
  • Bowls too small, incorrectly positioned leading to accidental tipping
  • Metal ball bearing sipper tubes injuring noses/paws preventing drinking
  • Poor dental health precluding proper chewing and saliva production
  • Gut stasis from illness or diet issues

Monitor for increased lethargy, sunken eyes, poor coat quality and loss of skin elasticity suggestive of moderate dehydration.

Severe cases can end in organ failure and require intensive therapy. Optimizing water intake prevents these catastrophic cascades.

Water Cleanliness and Hygiene

Water bowls easily accumulate organic debris, fur and saliva residue. Guinea pig systems are also sensitive to imbalances.

Ensuring clean water

  • Use two water bowls per cage to facilitate cleaning cycles
  • Scrub bowls thoroughly daily with soap, hot water and disinfectant solution
  • Rinse thoroughly post-cleaning to prevent residue ingestion
  • Refresh water twice daily at minimum

Investing time in perfecting suitable watering systems tailored to each piggy’s needs and environment helps them thrive. Paying attention to demeanor provides insight into their health and wellbeing.

Daily Diet Guidelines for Special Life Stages

So far, the basic guinea pig diet guidelines target healthy adults in an optimal weight range without special needs.

However, tailored adjustments help support changing nutritional needs at certain life stages.

Baby Guinea Pigs

Wean baby guinea pigs onto solid foods once they reach 3-4 weeks old—transition by offering alfalfa hay and pellets initially before slowly shifting to timothy hay and veggies.

Key pointers for growing pups:

  • Feed alfalfa-based pellets to meet protein needs
  • Mix in meadow/oat hay for variety and palatability
  • Introduce veggies earlier than usual – cucumber, zucchini, lettuce etc
  • Unlimited hay access supports healthy digestion
  • Scatter feed pellets to prevent selective feeding
  • Ensure CONSTANT access to water for hydration

Once hitting 3 months old, transition to timothy hay, fortified adult guinea pig pellets and greater vegetable variety.

Senior Guinea Pigs

As guinea pigs hit old age – usually 5+ years, tailor their diet to support health. Age-related considerations include:

Dental Health

  • Select soft orchard grass or oat hays
  • Soak pellets and veggies to ease chewing
  • Check teeth alignment frequently as overgrowth risks increase


  • Increase hay and greens to prevent gut stasis
  • Add probiotics to support gut flora
  • Avoid sudden food changes

Weight Management

  • Increase pellets calcium and vitamin D levels
  • Adjust portions to prevent obesity
  • Increase low calorie greens

With age, gut microbiome balance, muscle strength and immunity declines. Optimizing nutrition and husbandry helps senior pigs enjoy excellent quality of life.

Pregnant and Nursing Guinea Pigs

Female guinea pigs demand specialized nutrition in the high metabolic demands of pregnancy and nursing. Recommendations include:

Second Half of Pregnancy

  • Increase high-calcium veggie options like broccoli, kale
  • Continue timothy hay-based diet
  • Probloat treats prevent gas pain


  • Increase protein and calcium – alfalfa, lactation pellets
  • Continue probiotics to maximize food intake
  • Support hydration and digestion
  • Help prevent mastitis and urine scalding

Once weaned around 3-4 weeks, slowly transition back to regular adult guinea pig feeding over 2 weeks.

The additional needs of young, infirm and breeding guinea pigs add complexity to feeding programs. But optimizing nutrition supports welfare across life stages.

Daily Feeding Schedule for Guinea Pigs

Maintaining a structured twice-a-day feeding schedule helps set your guinea pigs up for success. As prey species, guinea pigs feel most secure with predictable routines. Aim to provide their diet components spaced through the day as follows:


  • Remove soiled hay debris from nighttime
  • Refresh clean hay supply
  • Clean, refill water bowls
  • Feed 1/3rd portion of vegetables


  • Refresh hay if heavily soiled
  • Top up water bowls
  • Feed daily pellet ration
  • Feed remaining vegetable portion

Ideally also do a midday hay and water bowl refresh if you have helpers at home. This ensures fresh access while you are out at work.

Adjust the split proportions of veggies and pellets depending on your own schedule but aim for two feeds. This prevents engorgement or starvation based on a single daily feeding session.

Guinea pigs are most active at dawn and dusk in keeping with their crepuscular nature. Aligning feeding windows with this maximizes intake. The midday hay refill sustains them during rest periods.

At cleaner times, you can also redistribute stray hay piles to create additional stimulation. The key is ensuring abundant fresh food without prolonged gaps that can lead to gastrointestinal or urinary health issues in small pets. Consistency gives guinea pigs the security of a stable environment.

Signs of Malnutrition in Guinea Pigs

Despite the best efforts with feeding, guinea pigs can suffer from primary malnutrition or from comorbid disease-associated malnutrition. Here are some red flags:

Primary Malnutrition

Caused by long term nutritional inadequacies, primary malnutrition red flags include:

  • Poor weight gain or weight loss despite normal appetite
  • Loss of skin and coat quality – flakiness, bald patches
  • Increased infections from immune suppression
  • Lethargy, disinterest due to muscle wasting and fatigue
  • Deterioration of previous training indicating cognitive dysfunction
  • Increased dental problems from lack of hay-wearing action
  • Lameness from tendon and ligament weakness

If your guinea pig displays increasing neglect of grooming, fading of previous training, disinterest in treats or toys they previously enjoyed or other signs of depression – suspect a nutritional deficiency rather than just age or illness.

Hair loss around eyes, mouth and limbs along with a potbelly and bony spine also signals improper nutrition. Review diet components and double check quantities, quality and freshness of all provisioned food.

Disease-Associated Malnutrition

Many diseases indirectly suppress appetite and nutrient absorption. This leads to secondary nutrition issues.

Common examples:

  • Dental disease from overgrown molars precluding chewing
  • Gastrointestinal conditions like dysbiosis and reflux
  • Infection-associated inappetence during recovery
  • Painful arthritis reduces mobility and food access

Optimizing nutrition helps the body heal itself alongside medical management of the inciting disease. This could require syringe-feeding recovery diets until the guinea pig regains strength and stabilizes metabolically.

Staying alert to changes from an individual pig’s baseline helps detect malnutrition early when it is easiest to reverse. Don’t attribute all eating changes to age without considering disease-associated malnutrition. With support, many guinea pigs bounce back thanks to their underlying resilience.

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