As dogs age, their behavior can change in a number of ways. Some of these changes are normal, while others may be a sign of a medical condition.
Older dogs tend to sleep more than younger dogs.
Older dogs may not be as active as they used to be.
Older dogs may eat more or less than they used to.
Older dogs may become less social or more irritable.
Older dogs may experience cognitive dysfunction, which can lead to changes in memory, learning, and behavior.
Pain can cause a variety of changes in behavior, such as decreased activity, increased vocalization, and changes in sleep patterns.