Hair and Skin  
The Skeleton  
The Muscular System  
The Nervous System  
The Digestive System  
The Urinary System  
The Reproductive System  

THE DOG'S MUSCULAR SYSTEM

In keeping with his role as a hunter, the dog has a well-muscled body. His muscles are tough and well coordinated. In some dogs, certain muscles are highly developed. Draft dogs, such as the Husky and Newfoundland, have powerful chest and back muscles. But all dogs have good muscles that help them run, jump and spring.

As with human muscles, those of the dog can be strained, stretched and otherwise injured. This is a point to keep in mind when you try to get your dog to jump too high or drag something that may be too heavy. He can get a charley horse just as easily as you can.