Rose Grass for Rats Duvoplus Grass is natural wild rose grass. This version contains wild rose. The grass is used as part of the diet of a rabbit or rat and must be of high quality. The grass contains an abundant amount of fiber and other important nutrients that the rat needs, and it contributes to promoting good intestinal flora. Additionally, the grass is essential for the natural wear of the rabbit's or rat's teeth and to avoid damage to the molars and incisors.