Pasture Hay is an ideal food for most small animals including rabbits and guinea pigs due to its high fibre and low calcium content. Perfect as a long-term feed option. Grass hay, such as Peckish Small Animal Pasture Hay should make up approximately 75% of your small animal’s diet. As your small animal grazes on the hay, they are benefitting their dental health as chewing wears down their teeth and keeps them physically and mentally stimulated.