Thirst and Hunger Behavior in Normal Dogs and the Effects of Vagotomy and Sympathectomy

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Abstract
Ad libitum drinking by dogs was recorded continuously following changes in environmental temperature, supradiaphragmatic vagotomy and bilateral thoracic sympathectomy. Data indicate: (a) the dog normally varied its water consumption by taking more or fewer drinks per day rather than by greatly changing the amount of water taken at each drink. Every adult dog favored a characteristic size of drink which was not affected by total water or food intake, environmental temperature, or small changes in body weight. (b) Vagotomy increased the size of the drink and food intake. Vagotomy probably severed afferent pathways carring "distention" stimuli. (c) Thoracic sympathectomy reduced the drink size.

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