Canine penis - Wikipedia - Penetrating dog vagina
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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 being tied together). Muscles in the vagina of the female assist the retention by contracting. the canine penis is not erect, and can only penetrate the. Canine reproduction is the process of sexual reproduction in domestic dogs, wolves, coyotes entering the female, canine copulation involves the male first penetrating the female, after which swelling of the penis In coyotes, when the female's vagina subsequently contracts, the penis becomes locked inside the female.