How to Introduce Two Guinea Pigs: Step-by-Step Bonding Plan

Before the first meeting

• •Quarantine a new pig in a separate room for around two to three weeks and arrange a vet check.
• •Confirm sexes, because accidental pregnancies are common.
• •Swap a piece of fleece or a hidey between cages so each pig learns the other's scent.

Step 1: Choose neutral territory

Meet on ground neither pig owns, such as a bathroom floor or a fresh playpen. A familiar cage triggers territorial behavior. Cover the floor with towels, scatter lots of hay and veggies, and add two exits on every hide or no hides at all.

Step 2: Let them sort out hierarchy

Expect rumbling, chasing, mounting, nose raising and teeth chattering. This is how guinea pigs agree who is in charge. Keep a towel or oven glove nearby but stay hands off as long as there is no real fighting.

Step 3: The first 48 hours

• •If the meeting goes well for several hours, clean the main cage completely so it smells neutral.
• •Move both pigs in together with doubled food bowls, water and hides.
• •Expect some dominance behavior to continue for one to two weeks.
• •Watch closely for the first day, then check frequently.

When to separate

• •Both pigs rise up face to face with raised hackles and teeth chattering that escalates.
• •Biting that draws blood.
• •A pig that is cornered and cannot eat or drink.
• •Rolling fights where fur flies.

If it fails

Separate with a towel, never bare hands. Some pigs need a second attempt after a few days; some pairs never work. A rescue that offers companion matching can help find a better match.

When to call an exotic vet

This guide is general education, not veterinary advice. If your guinea pig stops eating, stops producing droppings, struggles to breathe, bleeds, or seems suddenly quiet, contact an exotic vet the same day. Guinea pigs hide illness, so small changes matter.