Harvey is my first Jack Russel Terrier. He has been a member of our family for over 12 years. Now a senior, he has slowed down considerably but he still loves his walks and his long bike rides at the beach. At 23 pounds, he still fits very comfortably in the medium and large Malibu front mount bike basket and in the Myrtle Beach rear mount bike basket. When it comes to riding in a basket, he's a real pro. He's so mellow that I don't have to clip him to the basket, but it's always a good idea... just in case.