The nutritionists and veterinarians at Hill's developed these tasty, crunchy biscuits especially for dogs enjoying a j/d, r/d, w/d or Metabolic prescription diet. These highly-palatable biscuits feature high levels of soluble and insoluble fiber to help your pup feel full and satisfied between meals. High levels of soluble and insoluble fiber help your pup feel full and satisfied between meals. Crunchy biscuits help maintain good dental hygiene between brushings by scraping plaque and tartar from his teeth as he chews.