How to Determine Gender on Guinea Pig?

How to Tell Your Guinea Pig Sex? 

It is quite simple, against information, we usually find! You can even tell the sex of a few days old little piggy. When the piglet reaches the age of about two weeks, sex determination shouldn’t cause any problems. You just need to know, what things you should pay attention to. 

Two Weeks Old Guinea Pig

In the pictures bellow reproductive organs of two weeks old piggies are described (of the girl and the boy).

“Hollows” of sex organs of a female guinea pig are in shape of letter “Y”.

In the drawing and picture of a boy, you can see a small ball (yes – it is an element which you are thinking of) from which a vertical line extends.

One Month Guinea Pig

There are not many differences between one month old pigs sex organs and two week old ones, although they are bigger.

The girl’s proportion of hollows is changing a bit – the vertical line of the letter “Y” is much shorter. Only diagonal lines are clearly visible.

The boy’s penis is much better visible.

Three-Months Old Guinea Pig

Reproductive organs of three months old individuals are already fully developed. 

There is no difference comparing to the one month old piggy. 

You can see well-developed testicles.

Growing Up

After The Birth

A piggy is born with fur and it is a size of a mandarin. The moment after it is licked by its motherlittle piggy starts to look around. A few hours after the birth, she starts going out of the house and touring the cage.
Little pigs have disproportionately big paws and head compared to the rest of their body. With time
however, body proportion will change to the benefit of the backside.

A Few First Days

Little pigs are very brave and curious about the world. After a few days they start eating solid food, although they still drink milk from their momfor anotherthreeweeks. Their walk is clumsy and sometimes they fall down. 

The First Month

About 3-4 week old pigs should stop drinking mother’s milk. They are already quite big. They reach the size of over half the length of the mother’s body.

They love to play and chase each other. They jump funny and they wave their little heads. Males start to show an interest in females at the age of three weeks, although the females don’t want to play this type of games.

When a pig reaches the age of one month, it is a perfect moment to give it away to new owner, if we don’t want to keep it.

Between the First and The Third Month

Females achieve sexual maturity in the second month of their life, and males in the third month (officially). However, it can happen that our little piggy will be ready for breeding at the age of one month. That’s why you should separate males from mother and sisters, when males reach age of one month. Around the second month little pigs start calming down. They become less energetic. They sit and lie more than jump and run around the cage. If we want to sterilize males, we must wait until they reach the age of three months. Only then they are big enough and have well developed testicles. The vet won’t do this earlier anyway.

After the Third Month

Pigs have already reached sexual maturity; still grow, but very slowly. A pig can grow until it’s six months old. 

Guinea Pig Grooming and Hygiene

It is necessary to do few things regularly and the piglet will be always clean and smell nice.

Cleaning The Cage 

– Once a month you should do a thorough cleaning – clean the entire cage and accessories;
– Change the entire bedding once a week and wipe the bottom of the cage with a wet handkerchief;
– It is necessary to change dirty bedding and throw out excrements and leftovers of food every day.

It is often said, that guinea pigs stink – it isn’t true. If you do the cleaning regularly you will avoid an unpleasant smell.

Cutting Claws

You should buy a claws clipper. 

Your guinea pig’s claws should be cut every month. It requires a little bit of skills and sometimes it is necessaryto ask somebody for help, because piggies don’t like this treatment, and they may struggle a lot. In such case someone should hold the pig while you are cutting its claws
Below it is presented, how to cut the claws. You can see a proper cutting line – green dashed line. Be careful not to cut the quick!


It isn’t necessary to bath your guinea pig. Some people recommend to wash it once a month. In my opinion you should bath the piggy only when it is really needed, especially that guinea pigs don’t like it. 
Sometimes it happens that the piggy stinks. It may be caused by different reasons. 
If the pig gets terribly dirty …. a bath is necessary.

You should wash the pig in slightly warm water. You may use a shampoo for babies or special one for animals. I use a shampoo for babies.

Sometimes pigs are scare of a hair drier, but it’s a splendid solution in the winter. If you don’t use the drier, you should hold the wet pig in a dry towel for a while. You can put slightly wet pig into the cage and move the cage closer to a heater.


Cutting and combing fur

Only long-haired piggies require cutting and combing fur. You should use a special brush or a comb. You should not allow for tangling up and overgrowth the fur.

Guinea Pig Diet

Proper diet is very important for guinea pigs, because these animals give a lot of attention and devote a lot of time to eating 🙂 
Creating a menu for a piglet is quite easy and cheap, although you have to remember a few simple rules:

Guinea pigs should have unlimited access to fresh water.

Give your piggy large amounts of fresh hay every day. 
It is non-absorbent and isn’t suitable for bedding, but it is a basic component of the diet.
An adult piggy should eat about one kilogram of hay a month. The hay is available with herbs and other plants, but it isn’t necessary.

Grains and pellets are important part of guinea pigs diet. 
Choose pellets intended for guinea pigs, which are enriched with vitamin C. Pellets for other rodents may not contain it. Pay attention, whether pellets you choose contains vitamin C, because your pet must absorb it (guinea pigs are unable to manufacture their own). If you fulfil thisconditionit isn’t necessary to buy the diet supplement with vitamin C. Pellets are more economical than grains, because the piggy won’t be picking its favourite grains. At beginning it’s better to buy a smaller package – if the piggy doesn’t like it; she won’t eat it. No arguments will help. Your piggy may scatter pellets all over the cage, and eventually pee on it. 

Grain sticks are a splendid solution.
They aren’t exposed to be scattered all over the cage or polluted. The sticks contain not only food, but also a wooden centre, so it can be used as a teething toy. However, a spoiled piggy won’t start to eat a grain stick,until you’ll remove it and put it on the bottom of the cage.
The biggest disadvantage is an artificial honey, which is often an ingredient of grain sticks. Pigs don’t like it.

Vegetables and fruits should be only an addition to guinea pig’s diet.

Guinea pigs should be fed witch vegetables and fruits once a day. Pigs like: 

– dill,
– parsley leaves,
– cucumbers,
– lettuce (in reasonable amounts),
– carrot,
– celery,
– root of a parsley,
– apples,
– bananas.

Pigs adore grass, dandelions and clovers.

However, if they come from lawns, meadows or parks; they might be polluted with excrement of animals and exhaust fumes, so your pig can be poisoned. If you decide to give your piggy some grass, wash it carefully. Leaves of certain trees are also recommendedfor example: leaves of willows and maples. As teething toy, the best choice is a branch of fruit tree. These branches are rich in tanning agents, that are good for your pig’s health. However if we don’t have any fruit tree’s branches, it isn’t a problem. 

Guinea pigs produce two kinds of excrements: inedible and edible (contain vitamin K and vitamins from the B-group) which are willingly eaten.

At the end, you should remember that every pig is different, and has its own preferences. Some piggies eat everything; other ones are more fussy and may be resentful, if they don’t get food, which they prefer. If you are a new guinea pig owner, remember – don’t overfeed it. Having a new piglet is often a big event at home. Everyone is excited seeing its eating…..and gives it a lot of treats. After some time, owners start to realize, that their piggy is to fat and it’s wrong to give it so much food. Howeverthe pig won’t understand it and will be demanding food in very “aggressive” manner: loud wheek with open snout….for very long period of time. Explanations or shouts will make no impression on the piggy. The pig might wheek even when it hears a rustle of a plastic bag – the pig will connect that sound with vegetables, which are often wrapped in foil.

A properly fed guinea pig has soft and shining fur. It is curious, likes exploring and playing. 

Origin of Guinea Pigs

Guinea pigs come from South America , and more precisely from the Andean region. So they inhabited the area of current Peru, Brazil, Paraguay and Bolivia. They were domesticated by Incas. Guinea pigs were bred for meat and for medical purpose. Currently, wild pigs are rare, although it is still possible to observe them in the Andes area. In southern America guinea pigs are still bred for food. If you go to Peru, where guinea pigs are particularly popular, avoid dishes, containing the word cavia in their name (guinea pig in latin is cavia porcellus) in restaurants. 

Wild guinea pigs aren’t divided into races – people after domesticating them, bred a few breeds. Wild pigs have short, smooth fur in one colour – grey-brown colouration called aguti. They are better built than domesticated pigs. They have stronger and longer limbs. Domesticated pigs are squat and less agile than their wild ancestors. 


Guinea pigs were brought to Europe in the 16th century. They became popular very quickly. From the beginning they were used as domestic animals, later also as laboratory animals, but they were supplanted by mice and rats, which reproduce much better.