<Dd> "Aging begins at birth, but its manifestations are not noticeable for several years . The first sign of aging is a general decrease in activity level, including a tendency to sleep longer and more soundly, a waning of enthusiasm for long walks and games of catch, and a loss of interest in the goings on in the home ." </Dd> <P> The most common effects of aging are: </P> <Ul> <Li> Loss of hearing </Li> <Li> Loss of vision (cataracts) </Li> <Li> Decreased activity, more sleeping, and reduced energy (in part due to reduced lung function) </Li> <Li> Weight gain (calorie needs can be 30--40% lower in older dogs) </Li> <Li> Weakening of immune system leading to infections </Li> <Li> Skin changes (thickening or darkening of skin, dryness leading to reduced elasticity, loss or whitening of hair) </Li> <Li> Change in feet and nails (thicker and more brittle nails makes trimming harder) </Li> <Li> Arthritis and other joint problems </Li> <Li> Loss of teeth </Li> <Li> Gastrointestinal upset (stomach lining, diseases of the pancreas, constipation) </Li> <Li> Weakness in muscles and bones </Li> <Li> Urinary issues (incontinence in both genders, and prostatitis / straining to urinate in males) </Li> <Li> Mammary cysts and tumors in females </Li> <Li> Senility </Li> <Li> Heart murmurs </Li> <Li> Diabetes </Li> </Ul> <Li> Loss of hearing </Li>

How old is a dog in dog years at 14