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.
When to Spay or Neuter Your Pet. 1  For dogs: While the traditional age for neutering is six to nine months, puppies as young as eight weeks old can be neutered as long as theyâre healthy. 2  For cats: It is generally considered safe for kittens as young as eight weeks old to be spayed or neutered. In animal shelters, surgery is often performed at this time so that kittens can be sterilized prior to adoption.