Guinea pigs, like other animals, can be prone to constipation due to a change in diet or a change in environment. How do you know if your guinea pig is constipated? He will most likely strain to poop and may even have very little poop in his cage. What poop he does have may be runny because the poop is trying to come out but is blocked or the poop could be hard and small. Call your vet if you see any of these signs in your guinea pig. Constipation can also occurs due to poor diet, lack of water, or even an intestinal blockage or impaction. A sign of blockage could include bloating, abdominal pain, straining to poop, and possible discoloration of the abdomen. Your vet will need to treat your guinea pig right away. If you want to learn more, click this website, or call your vets East Valley, AZ.