Instructions
Calm your pet by holding it softly in your hand and speaking in a hushed tone.
Cup the guinea pig in your hand with its back settled into the palm.
Gently spread the hind legs apart and view the animal's genital area.
You will be looking for a small Y shaped area.
Tap your index finger right above the Y shaped area.
After you tap you will notice that the Y shaped area will open slightly.
If a small bump protrudes from this opening then you have a male guinea pig. If you notice a small area of smooth skin in the opening then your pet is a female guinea pig.
After following these steps you can go ahead and decide on a proper name for your pet.
How to Tell a Male Guinea From a Female Guinea
You have taken the plunge and purchased a guinea pig as your family pet. Now you want to know if you should name your pet Ralph or Ruthie. Determining the sex of a guinea pig is a fairly simple process. You may want to learn this process before purchasing a guinea pig because these animals can become impregnated while still very young. If you buy a female pet you may be surprised to have more than one once it has settled into your home.