Dogs have been extensively used in heart research, but their coronary arteries differ from those of humans - they have smaller connections with one another and the left coronary artery dominates, while in humans the right does so. In addition, the conduction system has a different pattern of blood supply, and consequently, researchers have had difficulty in producing ischemic heart blocks in dogs, which occurs frequently in humans. The blood coagulation mechanism is unlike ours, therefore using dogs to test prosthetic devices and valves is unreliable. A dog's reaction to shock is also very different to that of humans.
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Burros (also known as Donkeys): Kind/gentle-eyed/velvety-nosed donkey/burro has been throughout history a burden bearer/used extensively in every other conceivable work, and the reward for his loyal service has been neglect/abuse/ridicule! Ever since the decline of mining and the invention of automobile the burro no longer being gainful to man, was abandoned. They banded together and lived off grazing lands which ranchers used for their sheep/cattle, and hunters for their target animals. War is declared on burros by shooting/burning/running them off cliffs to their deaths!'
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