The medium-sized dog tennis balls with squeakers, measuring 2.5 inches, are designed to provide interactive and stimulating play for dogs of medium size breeds. They are typically made of rubber or similar materials that are tough enough to handle a dog's bite without easily breaking apart. One notable feature of these tennis balls is the built-in squeaker. When squeezed or bitten, the squeaker produces an exciting sound that captures a dog's attention and adds an extra level of fun to playtime. The squeaking noise stimulates many dogs and keeps them engaged and entertained during play. The medium size of these tennis balls makes them suitable for medium-sized breeds. They are easy to spot, grab, and retrieve for dogs during play. The size also allows for engaging outdoor play, whether it's a game of fetch in the park or interactive play in your backyard. While these balls provide entertainment and mental stimulation for your dog, it's important to supervise them during play to ensure their safety. Regularly check the condition of the ball and replace it if it becomes damaged or worn out to avoid any potential harm to your furry friend.