The brown dog was a mongrel of the terrier type, probably a former stray or pet, weighed 14 lb (6 kg), and had short rough hair.[16] He was first used in a vivisection in December 1902 by Starling, who had cut open the dog's abdomen and ligated the pancreatic duct.[17] The dog lived in a cage for the next two months, reportedly upsetting people with his howling.[18]
He was brought back to the lecture theatre for another demonstration on 2 February 1903. During this second procedure, he was stretched on his back on an operating board, with his legs tied to the board, his head clamped into position, and his mouth muzzled to keep him quiet.[19] In front of the audience, Starling cut the dog open again to inspect the results of the previous surgery, after which he clamped the wound, then handed the dog over to Bayliss, who wanted to look at the salivary glands. Bayliss cut a new opening in the dog's neck to expose the glands. The dog was then stimulated with electricity to demonstrate that salivary pressure was independent of blood pressure.[17] Bayliss was unable to show this, and gave up trying after half an hour.
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