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Why Guinea Pigs Eat Poo

Updated on December 26, 2016
Goes in as carrots, comes out as beans
Goes in as carrots, comes out as beans

It's not actually poo that the guinea pigs are eating. However, it looks like poo and comes out of the same place. And it's actually vital to your guinea pig's health and well being. Truth is definitely stranger than fiction.

Name That Pellet

Guinea pigs excrete two kinds of dark brown pellets. One is the poo we all know and expect - the other is a compound of vitamins and proteins that help the guinea pig digest B vitamins. These are called ceacotrophs. They are very similar to the cud that hoofed animals like cows, deer and giraffes produce. They can't chew their food enough in order to properly digest it - so in cud's case, it settles in the rumen to be worked on by acids, then shot back up the esophagus for another chew. Now, it can be digested. In a guinea pig's case, they don't have rumens, so the "cud" comes out the other way for a second chew.

Caecotrophs are squishier and smellier than their poop counterparts. You will very rarely ever see them. If you do see them, that's usually not a good sign. Guinea pigs usually ingest them as soon as they know it's about to pop out. If you've ever seen your guinea pig chewing after cleaning his or her behind, you no know what he or she is chewing on. If your guinea pig does not eat these, they will become malnourished very quickly.

Older guinea pigs, especially boars (males) but very occasionally in sows (females), loose the muscle tone in their anus regions. This can sometimes lead to impacted bottoms, where the poo and the caecotrophs won't come out. You or a vet will have to manually ease the lump of excreta out. The guinea pig might want to at the lump. Don't stop the piggy.

In the meantime, your piggy will need some special foods to keep him or her from getting malnourished. Tasted wheat germ is recommended, as well as water soluble vitamin supplements (if your piggy is still drinking normally). When in doubt, call the vet, please!

Rabbits Eat This, Too

Rabbits also produce caecotrophs, so if you see a rabbit munching on what seems like poo, don't worry. You usually won't see them, as the rabbit instinctively knows when it's coming. If you do see a lot of rabbit caecotrophs about, it's usually not diarrhea as some older rabbit care manuals suggest. It means the rabbit is on too rich of a diet. If the rabbit still refuses to eat caecotrophs, then you need to see a vet.

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