Guinea pig poop – a guide to your guinea pig’s health

Your guinea pig’s droppings are one of the most important clues to how well its digestive system is working and how healthy it is overall. So what color, shape, and consistency should healthy guinea pig droppings have? Read on to discover what your guinea pig’s droppings reveal about its diet and when it’s time to call the vet.

A healthy guinea pig produces plenty of hard, uniform droppings. Here’s what normal guinea pig droppings look like:

• Shape – oval or cylindrical, resembling grains of rice; this shape indicates normal intestinal fermentation.
• Texture – well-formed and firm, yet crushable under pressure and not crumbly; this texture shows that your guinea pig’s diet has enough fiber and that it’s drinking enough water.
• Color – dark brown.
• Odor – mild, often described as hay-like.

Guinea pigs should have multiple bowel movements throughout the day. If you notice fewer droppings than usual, it can be an early warning sign of a gastrointestinal obstruction.

When you clean the cage, keep an eye out for any changes in the shape, consistency, or amount of feces. Any change like this deserves closer attention and a chat with your vet, especially if it lasts more than 12–24 hours. Watch out for:

• Small and dry feces. Tiny, round, crumbly pellets can mean your guinea pig isn’t eating enough hay. That can lead to dental issues and abnormal gut motility. Check in with your vet and boost the hay supply.
• Feces that form “strings.” The droppings may look normal at first glance, but if they’re linked by a thin strand of hair, that’s not a good sign. It points to excessive grooming, which can raise the risk of a gastrointestinal blockage.
• Soft feces or diarrhea Loose, mushy, or watery droppings are a serious red flag. Stress, a sudden diet change, certain medications, or illness (such as an infection) can all be to blame. Diarrhea can quickly lead to dehydration, so it’s important to consult your vet.
• No bowel movements. If your guinea pig hasn’t passed any feces for several hours, that’s a major concern. Pain, stress, sickness, or too little fiber could be the cause. If there’s been no poop in 4–6 hours, contact your vet right away.

Besides regular droppings, guinea pigs also produce soft, light-brown, shiny clusters called cecotrophs, which they eat straight away. Why? Cecotrophs are packed with vitamins B and K, and eating them helps your guinea pig replenish essential nutrients. If you spot cecotrophs in the cage, it could mean your guinea pig has too many of them or isn’t feeling well – for example, sore joints might make it hard to reach and eat them.

Remember: a diet made up of about 80% fresh hay is the gold standard for picture-perfect guinea pig droppings!

Agnieszka Górecka, DVM

TropiFit and TropiDog brand specialist; graduate of the Faculty of Veterinary Medicine in Wrocław; certified dog and cat massage therapist. She has completed numerous courses in canine and feline nutrition led by experts from Poland, the UK, and the USA. She is the author of many articles on animal health and nutrition.