- And got the T-shirt
I'd suspect something they ate, although there could be other causes. And yes, it could bother some but not others -- some guinea pigs are just way more susceptible to digestive upsets than others.
Had you fed them anything new at all? Any change in diet? Fed larger amounts than usual?
- Contributor in 2018
A few years back, I had four guinea pigs and two of them bloated after I fed them some blueberries, but the other two were fine. Blueberries were not new to them, they had them all of their lives. I suspect either something wrong with the batch of berries, or possibly just the age of my guinea pigs. Sometimes as they age, they lose their ability to digest certain foods.