Older pets do not react well to changes in their routine. They also become set in their ways. In older pets it is advisable to arrange a sitter rather than put the pet in a kennel if travel for the owner becomes an issue. The pets environment and routines will have only a minimal change. Stress causes an increase in your pets heartbeat and their muscles tense.
Extra energy is needed to help cope with stress.
Adding a little extra comfort food is recommended. Usually a little more protein and fat are a good idea. For an amount specific to your breed consult your veterinarian. Stress can cause a change in your pets behaviour. Changes can be aggressive behaviour or complete depression.