Why do dogs get stuck together when breeding?

Bulbus Glandis. This swelling of the penis is located toward the rear end of the OS penis. As soon as the male dog inserts his penis into the female's vagina and begins to thrust, the bulbus glandis enlarges to a firm spherical shape, resulting in the so-called "coital tie." This tie prevents the male dog and the female from separating immediately after ejaculation and may last from 5 to 60 minutes.also during a females climaz they try to hold the pleasure(male organ) in for as long as possible however in most cases it is ussualy the sweeling of the male:) hope u understtod:)-j