Can Guinea Pigs Change Gender: Identifying Male and Female Guinea Pigs

Guinea pigs can’t change sex even with the use of testosterone injections. However, when it comes to gender, there are a few clues that can help you determine the guinea pig’s gender. For example, male guinea pigs have larger genitalia than female guinea pigs, which can help determine their gender. If all else fails and you cannot confirm their gender by any other means, you can try a DNA test or ultrasound scan.

Identifying the Gender of a Guinea Pig

Through Sexual Maturity

When guinea pigs reach sexual maturity (usually around six months old), they will start breeding season. During this time, female guinea pigs will give birth to litters of babies; baby guinea pig genitals determine their gender.

If the genitalia looks like a male, the animal will be raised as male, and if they look like a female, it’ll be presented as female. Unfortunately, sometimes mistakes are made, and eggs or babies that should have been raised as males end up being raised as females and vice versa-resulting in some frustrated pig owners!

Through Their Size and Weight

Guinea pigs are a great way to learn about reproduction. As soon as they are born, their size and weight will give you a good indication of the sex of the guinea pig. You can also check for behavioral clues, like whether they seem more active or passive when in their pen.

Taking Your Baby Guinea Pig to a Vet

There is no need to be anxious when taking your baby guinea pig to a vet – they are not sexually dimorphic and will not change gender as they grow up. If you are unsure about their gender, it is always best to take them for an examination.

At-Home Examination

Sometimes it’s difficult to know what gender a guinea pig is – this is where an at-home examination comes in handy. By checking their genitalia, you can quickly determine male or female guinea pigs. If you’re looking for chromosomal abnormalities, a microscope can also help identify any problems your pet might have.

Performing an at-home examination is the simplest way of identifying your guinea pig’s sex and any associated health problems. So make sure to do it before buying them so you are not disappointed later on!

Asking a Professional

There is no one-size-fits-all answer when it comes to guinea pig gender identification. That’s because guinea pigs can change their gender over time, and there is no way of knowing which one it is until the procedure has been done.

Meanwhile, a gonadectomy or neuter procedure might be the best option for your pet. Consult your vet to learn more about these procedures, and remember that this decision may not be reversible – once you have decided on a course of action, you will have to stick with it!

Sex-Typed Behavior

Guinea pigs are sexually dimorphic, which means their sex is easily identifiable. Male guinea pigs will typically be more aggressive and attempt to take over the colony, while female guinea pigs will be more nurturing. If you do not know the sex of your guinea pig, you can usually determine it by observing their behavior. To confirm sex, a veterinarian may need to perform an ultrasound or blood test.

Precautions Should Be Taken During Gender Identification

Guinea pigs can change their gender, so it’s essential to be aware of this possibility. However, you can do a few things to ensure the guinea pig is really of the opposite sex.

  • First, take a look at its external genitalia. If they look different from when it was a male or female guinea pig, it’s probably male or female, respectively.
  • Secondly, perform a physical examination of the guinea pig to see if it’s acting differently.
  • Finally, consult a vet or qualified animal care professional to confirm the guinea pig’s gender.

If you’re still unsure, err on caution and ask your veterinarian. They’ll be able to guide you through the proper identification procedures.

Buying a Guinea Pig: Male vs. Female

If you’re considering getting a guinea pig, it’s essential to know that guinea pigs can change gender. This means you’ll need to buy a male or female guinea pig, depending on your needs. So before you hit the guinea pig market, ensure you have a clear idea of what you’re looking for.


There are a few things to consider regarding guinea pigs based on their personality. For example, if you want an active pet requiring plenty of room to run and play, male guinea pigs are better options than female ones.

Females can be quite noisy and may need more time than males to get used to new surroundings. Guinea pigs do not change gender until they reach six months old – so no worries if you get one as a young child!


There is no doubt that guinea pigs make great pets – they are social animals that love to cuddle and form bonds with their owners. So if you’re the type of person who wants an interactive pet, go for a female guinea pig.

Males can be more independent, making them harder to train, but they can also be entertaining. But, ultimately, it all comes down to your personality – if you like quirky characters, then male guinea pigs might be a perfect choice!

Based on How They Should Be Cared For

Guinea pigs are sexually dimorphic animals, and male and female guinea pigs differ in size, coloration, and behavior. Therefore, when it comes to guinea pig care, it is essential to understand that males will be larger and more robust than females.

Also, pregnant female guinea pigs will birth to litters of six to eight babies. Children should not handle male guinea pigs – they can get their penises stuck in the animal’s neck!

Suitability for Owners.

When buying a guinea pig for the first time, it is essential to consider its suitability for owners. This means assessing whether the guinea pig is more active or docile, male or female, and so on. Additionally, ensure that the individual you’re purchasing from is of good quality – some males can be aggressive, while others are more docile.