Far from the rambunctious puppy they were years before, your senior dog is most likely cool and collected. For many people, a senior pet is new territory, but learning what to expect can help your dog stay happy and healthy for years to come.
“Many common older dog behaviors are likely due to normal aging, such as reduced or painful mobility, organ decline, loss of hearing or sight, and natural cognitive decline. If your dog can't hear you well or finds it painful to move, they might be less likely to come when called or let you know when they need to go outside. Some senior dogs also become more aggressive, but this could be because it becomes harder to walk away from whatever is bothering them.” (Petcarerx.com)
Make note of any changes in your dog’s behavior and let your vet know at your dog’s next check-up appointment.