I was worried that this study might involve 'creating stress' in dogs in a laboratory setting when I read the title, but this seems to be a survey type study of dogs in the home setting. (I'm not sure if the 'well-behaved' dogs living longer is really a stress-related issue.)
The effects of fear and anxiety on health and lifespan in pet dogs
Nancy A. Dreschel
Department of Dairy and Animal Science, Pennsylvania State University, United States
Available online 6 May 2010.
Fear and anxiety-related behaviors are common in pet dogs and are likely to cause a physiological stress response in individuals that are exposed to those things they find fear or anxiety-inducing. Stress responses are related to a number of changes in hormonal and immune modulation and have been shown in many species to be related to disease processes and shortened lifespan. It was predicted that dogs with fear and anxiety disorders would have decreased lifespan and increased disease frequency and severity.
In this retrospective study, owners of 721 deceased dogs completed a 99 question on-line survey that asked about the demographics, training, behavioral characteristics, health history, age at and cause of death in their pets. Correlational and regression analyses were performed to explore relationships between behavior; fear and anxiety subscales; lifespan; and specific diseases and causes of death.
Results show that how “well-behaved” an owner felt their dog was positively correlated with lifespan (R2 = 0.18, P < 0.001). Dogs with extreme non-social fear and separation anxiety were found to have an increased severity and frequency of skin disorders (R2 = 0.03, P < 0.001). While neither stranger-directed fear nor any other fear or anxiety scales were related to specific causes of death, fear of strangers was found to be related to a significantly shortened lifespan (R2 = 0.16, P < 0.001). There is evidence to suggest that the stress of living with a fear or anxiety disorder can have negative effects on health and lifespan in the domestic dog.