Anatomy of the Canine Male Urogenital System - EasyAnatomy - Dog penis bulb
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Male canids have a bulbus glandis at the base of their penises. The penis sometimes emerges few animals that have a locking bulbus glandis or also known as a "bulb" or "knot", a spherical area of erectile tissue at the base of the penis. The bulbus glandis (also called a bulb) is an erectile tissue structure on the penis of canid For domestic dogs the tie may last up to half an hour or more, though usually less. The bulbus glandis also occurs in the penises of some pinnipeds.