Flyball is not limited to the size of the breed, as smaller dogs such as Patterdale Terriers, Jack Russell Terriers, Whippets and even miniature poodles, often compete with great success in mixed-breed teams (teams consisting of dogs of various sizes and breeds).
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It is an especially effective way to burn off the energy of dogs with a high drive to work, such as Border Collies and Staffordshire Bull Terriers.