Canine penis - Wikiwand - Bulb on dog penis
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Male canines are one of the few animals that have a locking bulbus glandis or also known as a ". Male canids have a bulbus glandis at the base of their penises. The penis sometimes emerges from the penile sheath during sexual arousal. During coitus the bulbus glandis swells up and results in a 'tie' (the male and female dogs known as a "bulb" or "knot", a spherical area of erectile tissue at the base of the penis.