Just right before ejaculation, the knot swells up and locks on the tightened circular muscles in the female Doggy’s vagina to produce a tie. The ‘tie’ retains the penis from falling out in the course of ejaculation. Typically, the mating pet dogs stay ‘caught’ for many minutes immediately after http://griffinjuemt.educationalimpactblog.com/18543064/helping-the-others-realize-the-advantages-of-animal-penis-dildos