The U.S. market for pet medications is growing, and is in a state of transition. Although many pet owners continue to purchase their pet medications directly from veterinarians, this traditional distribution model has been challenged by the entry and expansion of retail businesses (both online and brick-and-mortar) that sell pet medications, as well as changes in the business practices of pet medication manufacturers, distributors, veterinarians, and retailers. This book provides an overview of the pet medications industry then examines prescription portability (prescriptions that can be filled by someone other than a veterinarian). The book also looks at distribution practices and the topic of generics. Recommendations on potential policy choices are made and areas that could benefit from additional study are identified.