Index

Introduction
Homeostasis
Life Span
Systems
Regulatory Functions
Nervous System
Eyes
Ears
Nose
Tongue
Brain
Endocrine System
Hypothalmus
Pituitary
Thyroid
Adrenal
Nutritional Functions
Excretary Functions
Urinary System
Kidney
Bladder
Colon
Distributive Functions
Cardiovascular System
Blood
Respiratory System
Protective Functions
Reproductive Functions
Musculo-Skeletal System
Cancer
Arthritis
Obesity
Diabetes
Cushing's Disease
Heart Disease
Teeth
Skin and Coat
Conclusion
References


Systems - Nose

The dog's nose is particularly spectacular in its function. The nose, as a sensory organ, goes hand in hand with a highly developed olfactory area of the brain to provide the dog with an extremely acute sense of smell. Atrophic changes with degeneration were observed in the olfactory epithelium of dogs older than 14 years; the changes were prominent in the dogs over the age of 17 years.vii

Other common aging changes include growth of tumors and polyps that may cause the dog to breath more through its mouth and less through its nose with a resultant loss of ability to smell. It is commonly believed that the dog's sense of smell contributes to its sense of taste. When the ability to smell goes, especially if combined with a loss of sight, it may be difficult for the older dog to find its food bowl, or to obtain much pleasure from eating.

Next Page - tongue