This is the new timothy based pellet for Adult Guinea Pigs. Dr. Sherwood worked hard to improve the nutritional value over previous formulas. You’ll see even better improvements in your piggies energy level better weight control and all the additional health benefits you should expect from Sherwood Pet Health formulas (softer fur, less urine odor, ext…). This new timothy pellet is concentrated so you should measure out a small amount of pellets and feed it with grass hay (1st or 2nd cut is best – the super soft 3rd cut is too rich and often leads to health problems).