How to Tell the Sex of Baby Guinea Pigs

Written by sara mcart
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How to Tell the Sex of Baby Guinea Pigs
It is not always easy to tell the sex of a guinea pig. (guinea-pig image by Danil Kashirskj from Fotolia.com)

Guinea pigs breed rapidly and that can be a big problem if you plan on just having a pair of them in your home. Determine the sex of each guinea pig before you put it into a cage with another guinea pig. Female guinea pigs (sows) are fertile creatures, and you must even be careful when buying them so you don't take home a pregnant sow. Males (boars) can be frisky. Be careful to not end up with a guinea pig farm.

Skill level:
Moderately Challenging

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Things you need

  • Mirror

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Instructions

  1. 1

    Relax your guinea pig. They like to be held close to the body, so hold it close and speak to it in a gentle tone.

  2. 2

    Get a good grip on the pig so it does not run away. Place one hand under its buttocks and one under its chest cavity.

  3. 3

    Stand as close to a mirror as possible. Position the guinea pig so you can see its underside in the mirror.

  4. 4

    Use the hand under the buttocks of the animal to expose and spread its genital area so you can closely examine it.

  5. 5

    Look for an area shaped like a Y that is open. Sows have an area of skin in the middle of the Y. Boars have a penis head that is small and button-shaped. Older males have testicles that are often visible easily on either side of the penis head.

  6. 6

    To confirm, tap the genital area firmly. A sow vagina will swell and the penis of a boar will harden and perk up a bit and expose itself. Avoid tapping on the testicles of the male.

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