Domestic dogs mark their territories by urinating on vertical surfaces usually at nose level , sometimes marking over the urine of other dogs. See also: Category:Urological conditions. During the storage phase the internal urethral sphincter remains tense and the detrusor muscle relaxed by sympathetic stimulation. After spinal shock has passed, a spinally mediated voiding reflex ensues, although there is no voluntary control and no inhibition or facilitation from higher centers. In placental mammals , urine is drained through the urinary meatus , a urethral opening in the male penis or female vulval vestibule. Mammalian Olfaction, Reproductive Processes, and Behavior. Cambridge University Press. A container or wearable urine collection device may be used so that the urine can be examined for medical reasons or for a drug test , for a bedridden patient, when no toilet is available, or there is no other possibility to dispose of the urine immediately.
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