Answers: 1.Circulatory system-pumping blood to and from the body and lungs with the heart 2.Digestive system-digestion and processing food with salivary glands, esophagus, stomach, liver, gallbladder, pancreas, intestines, rectum, and anus.
During the tie, the male turns around so the dogs are back to back and can defend themselves. The tie typically lasts 20 to 40 minutes. It may be just a few minutes, and dogs can mate successfully without becoming tied at all. The evolutionary reason for the tie is unknown, but it's assumed that if a male dog is tied to a female, it prevents other males mating with her. Unwanted Mating.
A Dog Knot Stuck Problem Occurs When Tying Lasts More Than 45 to 60 Minutes. In the normal act of breeding, tying is a normal phenomenon, in which the bulbis glandis or âknotâ at the ventral side of penis swells in the vagina due to the high blood supply it contains.