Why Is My Guinea Pig Eating Its Own Poop? Cecotropes Explained

The short answer

It is normal. Guinea pigs produce a second type of dropping called a cecotrope in the cecum, a fermentation chamber in the gut. They eat these directly from their bottom to absorb B vitamins, protein and other nutrients that pass through the first time.

You may see your pig curl over as if grooming its belly. That is usually cecotrophy, and most owners rarely see the cecotropes themselves.

Cecotropes vs normal poop vs diarrhea

• •Normal droppings: firm, oval, dry, plentiful.
• •Cecotropes: softer, darker, shiny or moist, sometimes clustered, usually eaten straight away.
• •Diarrhea: wet, loose and shapeless, often smearing fur and bedding.

When leftover cecotropes are a warning sign

Finding the occasional uneaten cecotrope is not an emergency. Repeated leftover soft droppings can mean the pig cannot reach its bottom, for example because of weight gain, arthritis, pregnancy or pain, or that the diet is too rich in pellets or fruit and too low in hay.

What helps

• •Unlimited grass hay as most of the diet.
• •Measured pellets and very limited fruit.
• •Gentle bottom checks for older or long-haired pigs.
• •A vet check for mobility problems in seniors.

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.