Pet Education Dogs
Pet Education Dogs Pet Education Dogs Pet Education Dogs

Pet Pharmacy & Pet Meds
Free Shipping on orders over $49
Video Center
Register your shelter with Paws for a Cause at DrsFosterSmith.com
Skeletal Anatomy: Bones, Joints and Muscles in Dogs
Drs. Foster & Smith, Inc.
Race Foster, DVM
Anatomy, Normal Values and Basic Science
Print Article | Email Article
Bookmark and Share
Click here for a pdf version of this article.  See related products at DrsFosterSmith.com Pet Supplies

illustration of the skeleton of a dogWhen we look at a dog, much of what we see is the result of the growth of the bones, muscles, joints, ligaments and tendons. The bones and muscles give the dog its general conformation or shape. In puppies we frequently use such terms as 'leggy,' meaning the legs appear longer than normal; or 'squatty,' suggesting short legs. The puppy may appear roly-poly or round, or it may appear long and spindly. In any event, these non-scientific terms attempt to describe how the young animal's bones and muscle tone have developed, or how they are developing.

A puppy is born with all the bones, joints, muscles, ligaments and tendons that it will ever have. All growth is due to an increase in size of these tissues, not to an increase in their number.

Bones, muscles, ligaments and tendons compose the bulk of an animal's body mass. Allowing for variations in tail length, there is an average of 319 bones in the dog skeleton.

Bones

Bones are complex, rigid, living organs that have their own supply of blood vessels and nerves. They are composed of minerals, primarily calcium and phosphorus. They provide both the framework for the body and protection for many delicate internal organs and structures. For example, the bones of the skull protect the brain and eyes while the breast plate (sternum) and ribs help protect the heart and lungs. Other bones, such as those of the limbs, function to provide support and locomotion. Bones of the internal ear structures function for neither protection nor support, but rather for sound transmission, allowing the dog to hear.

The bones of the legs grow from areas of immature bone located near the ends. These are called the growth plates, epiphyseal plates or simply the epiphysis. Growth plates are soft areas of the young bone that grow and add length to the bones. Growth plates provide growth to the bone until the puppy's bone growth is complete, usually by one year of age. At this time, the growth plates become hard with calcium and minerals and no longer function as areas of growth. This mineralization is referred to as a closing of the growth plates and indicates the end of significant bone growth. The young unmineralized growth plates are a weak area in the puppy's bone and are frequent sites for bone injury or fracture. Epiphyseal fractures are common near the wrist (carpus) and the knee (stifle).

Muscles

The primary function of muscles is to bring about movement to all or a part of the dog's body. There are two types of muscles, smooth and striated. Smooth muscles are found within the internal organs such as the intestines, stomach, and bladder. These are not subject to voluntary or conscious control by the individual. They function automatically to satisfy the body's needs. Striated muscles are predominately attached to the skeleton. All of their movements are under the conscious control of the individual. They are involved with such things as walking, eating, tail wagging, eye movement, etc.

Tendons

Muscles are connected to the bones by tough fibrous bands called tendons. Tendons begin on a muscle and end on a bone. A good example is the Achilles tendon, which connects the muscle of the lower rear limb (calf) to the bones forming the ankle.

Ligaments and joints

Ligaments connect bone to bone and are generally found spanning across joints. Joints are places where two bones meet or articulate with their ends covered by a layer of smooth cartilage. A joint consists of bones, muscles, ligaments, cartilage, and a lubricating joint fluid all enclosed by a tough joint capsule.

 

RELATED ARTICLES:
Normal Joint Anatomy in Dogs 
Click here for a pdf version of this article.  See related products at DrsFosterSmith.com Pet Supplies  
Print Article | Email Article
 
 
Drs. Foster & Smith Joint Care Premium Plus®
Drs. Foster & Smith Joint Care Premium Plus®
As low as $19.99
 
Drs. Foster & Smith Joint Care 2 with MSM
Drs. Foster & Smith Joint Care 2 with MSM
As low as $19.99
 
Drs. Foster & Smith Premium Plus® Omega-3 Gel Caps or Chews
Drs. Foster & Smith Premium Plus® Omega-3 Gel Caps or Chews
As low as $12.99
 
Drs. Foster & Smith Vitacaps®
Drs. Foster & Smith Vitacaps®
As low as $6.99
 

Facebook YouTube Blog Connect with us

Subscribe to email newsletters:
featuring helpful articles, tips and online only product specials from Drs. Foster & Smith. Learn more here !

About Us Article Reprints Awards & Memberships Request a FREE Catalog Tell a Friend
Meet Our Staff Terms & Use Site Map Free Newsletters Links to Us
Visit our other websites: Doctors Foster and Smith Pet Supplies LiveAquaria.com - Quality Aquatic Life Direct to Your Door
For product information, call 1-800-826-7206

Copyright © 1997-2013, Foster and Smith, Inc. - 2253 Air Park Road, P.O. Box 100, Rhinelander, Wisconsin, 54501. All rights reserved.