Air Fetch Dog Ball: These high-performance balls for dogs have a hollow, mesh-like design that helps facilitate breathing and airflow into your dog's lungs while running and fetching; a breathable alternative to standard tennis balls Run Further, Fetch Longer: Chuckit! Dog Fetch Balls are compatible with Chuckit! Dog Ball Launchers. Can also be used as a treat toy for dog training by utilizing the openings to stuff dog treats inside. Also floats for water or pool play Sizing matters: Size medium measures 2.5" in diameter and is best suited for dogs weighing 20-60 lbs. The ball should be small enough for your dog to carry, but large enough that the ball can't completely fit in their mouth. When in doubt, buy a size up Make Fetch Happen: Chuckit! Performance toys are designed with you and your dog in mind; Try our full range of interactive indoor and outdoor dog toys including tumblers, flyers, fetch toys, chew toys other balls for dogs and more CHUCKIT!: For 20 years, Chuckit! has been leading the game of fetch. The special connection between pets and owners is at the heart of every toy we make. With iconic shapes and vibrant colors, Chuckit! toys elevate every adventure, strengthening the bond between you and your furry friend.