Guinea Pig Cavia porcellus
The gentlest small pet available, and one that talks back β they communicate through a real vocabulary of squeaks. Two hard requirements get overlooked: they cannot synthesise vitamin C and must be supplied it daily, and they are strictly social, so keeping one alone is a slow form of deprivation.
βοΈ Legal status Β· Legal to keep
A common captive-bred pet. Not CITES-listed and not a protected species in China, so keeping one is legal. Non-native β never release it.
Check another species βKey parameters
- Lifespan
- 5-8 years
- Adult size
- 20-30 cm, 700-1200 g
- Diet
- Strictly herbivorous. Unlimited timothy hay as the staple, vitamin-C-fortified guinea pig pellets, and fresh vegetables daily (bell pepper, kale and similar)
- Temperature
- 18-24 Β°C. Above 26 Β°C risks heatstroke; below 15 Β°C invites respiratory illness
- Humidity
- 40-70%, in a dry well-ventilated space
β Suits you if
Anyone wanting a daytime-active, gentle, handleable pet who is willing to keep two or more
π« Do not get one if
Anyone set on keeping just one; homes without room for a 1 mΒ² cage; households that cannot control summer temperature
Starter equipment list
Buy all of it before the animal arrives, not after.
- Cage: at least 0.7 mΒ² for one and 1 mΒ² for a pair β most commercial guinea pig cages fall well short
- A single flat level is fine. Guinea pigs do not climb, and wheels and exercise balls must never be used β they cause spinal injury
- Unlimited timothy hay plus a hay rack
- Bedding: paper bedding or dust-free shavings. Never cedar or pine, whose volatile phenols damage the liver
- Hides: at least two, and always one more than the number of pigs, so nobody has to compete
- Ceramic food dish, ball-bearing water bottle, and a vitamin C supplement
Most common beginner mistakes
- 1 Not supplying vitamin C β like humans, guinea pigs cannot make their own, and going without means scurvy. Rabbit pellets contain none and are not a substitute
- 2 Keeping only one β guinea pigs are highly social and prolonged solitude is a chronic stressor. Some countries legislate against keeping them singly
- 3 Using a wheel or exercise ball β a guinea pig's spine is not built to arch and run, and these cause serious injury
- 4 Feeding rabbit pellets β besides the missing vitamin C, the calcium balance is wrong and leads to stones over time
- 5 Cedar or pine bedding β volatile phenols damage the liver and airways
- 6 Switching food or hay abruptly β their gut flora is very sensitive, so transition over 7-10 days
Common illnesses
| Illness | Common cause | What you'll see |
|---|---|---|
| Scurvy (vitamin C deficiency) | Guinea pigs cannot synthesise vitamin C and the diet fails to supply it | Swollen joints, limping, rough coat, bleeding gums, wounds that will not heal |
| GI stasis / bloat | Not enough hay, an abrupt diet change, stress | Stops passing stool, hard distended abdomen, hunched and immobile, refusing food β escalates fast, see a vet immediately |
| Malocclusion (overgrown teeth) | Long-term lack of coarse fibre to wear the teeth down | Drooling wetting the chin, eating only soft food, eating slowly, losing weight |
| Respiratory infection | Damp conditions, poor ventilation, dusty bedding, temperature swings | Sneezing, nasal and eye discharge, audible breathing, lethargy |
| Bumblefoot / pododermatitis | Wire cage floors, damp soiled bedding, excess weight | Red swollen scabbed footpads, limping, reluctance to move |
Frequently asked
Why is vitamin C so important?
Guinea pigs, like humans and other primates, lack the enzyme needed to synthesise vitamin C and must get it from food. Without it they develop scurvy: painful swollen joints, collapsing immunity and wounds that will not heal. Give high-vitamin-C vegetables such as bell pepper daily, or use fortified pellets β and note that vitamin C oxidises over time, so do not keep an opened bag too long.
Do I really need two?
Strongly recommended. Guinea pigs live in groups in the wild, and keeping one alone causes ongoing social stress that shows as reduced appetite and activity. If you truly can only keep one, you will need to compensate with a great deal of daily company β and it still falls short of a companion. Pair them same-sex, or they will breed continuously.
Guinea pig or hamster for a beginner?
Their social needs are exactly opposite: guinea pigs must be kept in groups, Syrian hamsters must be kept alone. Guinea pigs are active in the day, gentle, rarely bite and live longer (5-8 years), but need much more space and a more careful diet. Want something you can hold and interact with, get guinea pigs; short on space and fine with a nocturnal animal, get a hamster.