No, I've fed them to my guinea pigs before and they were fine. They are not poisonous to guinea pigs. But always be careful about what wild plants you feed your guinea pigs because some are poisonous to them.
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I do not own a Guinea Pig, but am hoping to get one and for what I know Guinea Pigs would LOVE Strawberries! I would try giving it one and seeing if it likes it first though before you give it to it regularly. But giving Guinea Pigs strawberries shouldn't cause any unusual reactions, if that's what your worried about.
Yes guniea pigs love berries,remember to make sure you know the kind of berries your feeding them. Goodones are blueberries,raspberry,chopped dried cranberry.