My friend brought 2 guinea pigs over for boarding. and a large bag of hay. So i used her hay to feed the guinea pigs, including mine, for about a week. I notice my guinea pig also had small poops, like a size and a shape of a small pea.
Later after they left, i used back my Timothy hay, now my guinea pigs' poop are back to big.
which poop size is generally healthy for guinea pig?