As @helen105281 says they should have veg everyday. Guinea Pigs do not produce Vit C and therefore can develop Scurvy if they do not have the aquired amount.Vet also said that they shouldn't have veg everyday- just every couple?
I think that sums up how little the vet knows guinea pigs! It is essential to have daily vegetables.Vet also said that they shouldn't have veg everyday- just every couple?