5 min read

How to Tell if a Guinea Pig Is Male or Female

How to sex a guinea pig by looking at the genital area, and why getting it right matters before pairing.

Why it matters

Mis-sexed pigs are a common cause of surprise litters. Confirm sex before pairing.

The genital opening forms a Y shape, with the urethra and vagina close together.

The opening looks more like an i or dot shape; gentle pressure above can reveal the penis. Adult boars often have visible testicles.

Young pigs can be tricky. A vet or experienced rescue can confirm.

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Poop & Pee Checker for care observations, not diagnosis

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Free to download on iPhone and iPad. Guidance only, never a replacement for an exotic vet.