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Certain breeds of dogs (particularly sight hounds, herding breeds and retrievers) love to chase moving objects as this fulfills their working instincts. However, this working drive can have its disadvantages in that the dog becomes so hooked on the excitement and adrenaline that is produced from these games that its body does not recognise when it is tired and gets over stressed. As with all things that are enjoyable -

"a little of what you fancy does you good, but too much can do you harm"