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 can only hold themselves for so long! The general rule is that a puppy can hold their needs for the hours that equal their age. For example, a 3 month old Shih Tzu can hold its needs for 3 hours and so forth. Once your Shih Tzu is 1 year old, they should be able to wait for 8 hours.If you will be gone for longer than that, it is best to have a friend, neighbor or family member bring your dog out for a walk. The Shih Tzu brothers: Min Su (black) Je Ju (white), 18 months.nce your Shih Tzu is 1 year old, they should be able to wait for 8 hours. If you will be gone for longer than that, it is best to have a friend, neighbor or family member bring your dog out for a walk. The Shih Tzu brothers: Min Su (black) Je Ju (white), 18 months.