Health problems such as infections, injuries, injuries from fights and changes in the amount of exercise can cause stress. Boarding in unfamiliar places, breeding, whelping, performing in shows, and travel can cause stress. A death in the immediate family of the owner which can cause a loss of affection can cause stress. Earthquakes, home fires, extra people in the home can cause stress. Sudden changes in the living area such as new furniture or a new home can cause stress.
Age is also a factor with stress.
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.