The guinea pigs love it. It is best for their health. Better than buying otger dry food supplements with all sorts of crap mixed into it. The timothy hay is suitable for guinea pig of all ages. Although if you want to feed your guinea pig wich is less than 1 year old then you can also go with alfalfa hey pellets. This product is great i have 2 guinea pigs and a pack lasts me 2 months on average. I feed them 2 scoops of pellets every day combined with vegetables and dry hey