<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>

How old are dogs when they get period