The Dog

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Term Paper Title	The Dog
# of Words	3474
# of Pages (250 words per page double spaced)	13.9

The Dog

The Dog

Domestic dog, carnivorous mammal, generally considered the first domesticated
animal. The domesticated dog has coexisted with human beings as a working
partner and household pet in all eras and cultures since the days of the cave
dwellers. It is generally believed that the direct ancestor of the domestic dog
is the wolf, originally found throughout Europe, Asia, and North America.
Remains of a dog, estimated to be 10,500 years old, have been found in Idaho.

TAXONOMY Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Carnivora
Family: Canidae Genus: Canis Species: Canis familiaris

ECOLOGY & HABITAT

Little is known about wild dogs of the past but that they are carnivores:
hunters and scavengers. This means that they are secondary consumers in web
chains. Eventhough they are carnivores they sometimes accept eating green plants.
The ecology of dogs right know is that it helps the human in many fields of life.
Since the cave dweller times, dogs have been domesticated by humans and it has
helped him to hunt, in herding, protection, etc. It has been very important as a
work animal and as a psychological support for humans. The habitat of the dog is
where it’s owner lives. Different dogs have different adaptations to their
ancestral habitat but nowadays, this is not applicable.

ANATOMY

SKELETON

The skeleton of the dog is the articulated structure, moved by the muscles, that
holds the dog’s body and protects some organs and the nervous system. It also
functions as mineral and blood deposit of the body. The skeleton of a dog is
made up of approximately 321 bones: 134 form the axial skeleton (skull,
vertebrae, ribs, etc.), and 186 form the appendicular skeleton (appendages). An
extra bone has to be added for male dogs which is the penile bone. The dog is a
digigraded animal (it walks with it’s toes). It lies on it’s third phalanges
which are protected by palm cushions. The dog’s toes are arranged in an angle
which gives more facility of rest after running or other activities. The teeth
of the dog is composed of 42 teeth which include canines, molars, incisors, etc.

JOINTS

Joints permit the movement of the bones. There are three types of joints in a
dog: fixed joints, movable joints, and semi-movable joints. Fixed joints, such
as the ones in the skull don’t permit any movement but keep the bones together.
The semi-movable joints are those that permit a little movement. They are
represented in the spinal column. The movable joints are ...

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