How To Sex A Guinea Pig

Are you curious about how to determine the sex of a guinea pig? Look no further, because in this article, we will guide you through the process of sexing guinea pigs. Whether you are a new guinea pig owner or simply interested in learning more about these adorable creatures, understanding their gender is an essential part of responsible pet care.

Determining the sex of a guinea pig can be challenging, especially if you have no prior experience. However, with a little knowledge and observation, you can become proficient in sexing guinea pigs. So let’s dive into the world of guinea pig genetics and anatomy to uncover the secrets of sexing these lovable animals.

Why is Sexing Guinea Pigs Important?

Sexing guinea pigs is crucial for several reasons. Firstly, when you bring home a pair of guinea pigs, it’s vital to know their genders to prevent unwanted pregnancies. Guinea pigs have a short gestation period of approximately 59-72 days, and without proper separation, you may soon find yourself with a rapidly increasing guinea pig population.

Secondly, knowing the sex of your guinea pigs is essential for their overall health and well-being. Each gender has different care requirements, and providing the appropriate care will ensure your guinea pigs live happy and healthy lives.

Determining the Gender of a Guinea Pig


Let’s start with the physical characteristics that can help you differentiate between male and female guinea pigs. Keep in mind that these are general guidelines, and some guinea pigs may have slightly different characteristics.

Male Guinea Pigs

– Male guinea pigs, also known as boars, have a noticeable penis sheath located just below the anus.
– They have a more pronounced and prominent genital opening compared to females.
– Boars also have a pair of testicles, which can sometimes be seen through the skin. However, these may not be visible until the guinea pig reaches sexual maturity.

Female Guinea Pigs

– Female guinea pigs, known as sows, have a Y-shaped genital opening located just below the anus.
– This opening is where the urethra and vagina meet, forming the Y shape.
– Sows do not have a visible penis sheath or testicles.

Behavioral Differences

Observing the behavior of your guinea pigs can also provide clues about their gender. Although these differences in behavior are not foolproof and can vary among individuals, they can give you a general idea.

Male Guinea Pigs

– Male guinea pigs tend to display more dominant behavior and may be more territorial.
– They are more prone to mounting, a behavior where they stand on top of another guinea pig and simulate mating.
– Boars may also exhibit “rumbling” sounds, which are low-pitched vocalizations associated with dominance.

Female Guinea Pigs

– Female guinea pigs are generally more social and less territorial.
– Sows may display nesting behavior, such as gathering bedding materials and arranging them in a specific area.
– They may exhibit a behavior known as “popcorning,” where they jump up and down excitedly.

Challenges and Tips

Determining the sex of a guinea pig can be tricky, especially when they are young or inexperienced. Here are some challenges you may encounter and tips to help you overcome them:

– Baby guinea pigs, also called pups, can be challenging to sex accurately until they reach around three to four weeks of age. At this point, their genitalia should become more distinguishable.
– Guinea pigs with long fur may make it more difficult to see their genitalia clearly. Gently parting their fur can help expose the genital area for inspection.
– If you’re unsure about the gender of your guinea pig, it’s always best to seek the advice of a knowledgeable veterinarian or guinea pig breeder.

Frequently Asked Questions

Q: At what age can you sex a guinea pig?

A: The most accurate time to sex a guinea pig is around three to four weeks of age when their genitalia become more distinguishable. However, some guinea pigs may show signs of their gender earlier or later.

Q: Is it safe to assume a guinea pig’s sex by its name?

A: No, it is not safe to assume a guinea pig’s sex based on its name. Many people give unisex or gender-neutral names to their guinea pigs, so it is always best to physically check their gender.

Q: Are there any health concerns associated with sexing guinea pigs?

A: When done correctly and gently, sexing a guinea pig should not pose any health risks. However, it’s essential to handle them with care to prevent injury or stress.

Final Thoughts

Understanding how to sex a guinea pig is an essential skill for any guinea pig owner. By familiarizing yourself with their anatomy and behavioral differences, you can confidently determine the gender of your furry friends. Remember to be patient and gentle when handling your guinea pigs, ensuring their safety and well-being. And if in doubt, don’t hesitate to consult a veterinarian or experienced guinea pig breeder for guidance. Now go forth and become a master of guinea pig sexing!

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