I would say, no. This product is a vitamin supplement only. Even though it has a timothy base, the guinea pigs need the whole hay, such as timothy, orchard, etc. to provide them with the chewing to help their teeth to not become over grown, and they need it for their digestive health. The hay, is the "main" staple to a guinea pigs dietary health, anything else, whether pellets, vegetables or fruit are only a supplement to the hay not to replace the hay. I hope this helps. I know the hay is messy, I put mine in a large bowl in their cage, and sometimes cut it to fit, but they'll take it out and eat as they choose. One, just sits with his front legs over the bowl and just sits there and eats...not messy at all, but all 3 have their way they prefer to eat.