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Stress in Performance Dogs: What We Can Learn from Fukushima

Studies show that dogs that have experienced stressful or traumatic events can show signs of post-traumatic stress disorder (PTSD). By Claudia Bensimoun.

Dogs that experience stressful or traumatic events can carry psychological trauma. Walk through any postmeltdown Fukushima dog shelter in Japan, and one will see the most common behavioral problems associated with post-traumatic stress disorder. (PTSD)

Dogs, like people, can feel stressed, confused, and unloved. Many dogs that were abandoned in the Fukushima exclusion zone after last year's nuclear crisis have had to survive many of devastating affects: high radiation levels, lack of food, freezing temperatures, and sudden changes in their environment and family unit.

The numerous meltdowns at the Fukushima Daiichi Nuclear Power Plant in March 2011 not only caused a humanitarian crisis, they created the worst-case scenario for all pets as well. More than 100,000 people had to be evacuated from within the 13-mile radius. Dogs were left feeling traumatized. Today, researchers have evidence that the Fukushima event was so devastating for the 5,800 dogs that were registered in the area that, when tested, these abandoned dogs displayed many symptoms similar to post-traumatic stress disorder in people.

According to Miho Nagasawa and colleagues who compared behavior patterns and levels of cortisol in the Fukushima rescued dogs, they found evidence that dogs do indeed suffer from post-traumatic stress disorder(PTSD)."We received stray or abandoned dogs from rescue centers in the Fukushima Prefecture. During re-socialization training and health care, we accessed the behavioral characteristics and the urine cortisol level of each dog and compared them with those of other abandoned dogs not involved in this earthquake. The dogs from Fukushima showed significantly lower aggression toward unfamiliar people, trainability, and attachment to their caretakers: also, urine cortisol levels in the dogs from Fukushima were 5-10 fold higher than those in abandoned dogs from another area of Japan.These results suggested that the dogs from Fukishima suffered from an extremely stressful crisis." Miho Nagasawa says via Nature's Scientific Report.

Nagasawa and his colleagues expected that the Fukushima dogs might still be under chronic stress and show behavioral and neuroendocrine stress responses that would be attributable to the environmental conditions post-Fukushima. They then proceeded to compare research data from disaster-affected dogs and those from Kanagawa, a non-affected area in Japan.

The results showed that the Fukushima dogs' urinary cortisol levels were highest on the day of arrival and then declined significantly after the 8th day, while the Kanagawa dogs showed no significant changes in urine cortisol levels over time.

These strays also demonstrated difficulty with learning and developing an attachment to humans. "The dogs from Fukushima showed significantly lower aggression toward unfamiliar people, trainability, and attachment to their caretakers." Miho Nagasawa says via AAAS. Science Now

Impaired learning and an inability to bond were two of the post-traumatic disorder symptoms displayed by both dogs and people. Although the Fukushima dogs seemed to improve with time, these dogs still remained anxious and more stressed than other dogs. They were not as friendly as other dogs.

Miho Nagasawa and his colleagues says that it still remains unclear whether the greater stress in the Fukushima dogs resulted from experiencing the devastating 9.0-magnitude earthquake in 2011, the strange and sudden disappearance of all humans, or the length of time it took to rescue all the abandoned dogs in Fukushima.

In order to recognize the signs of stress in performance dogs, one must try to visualize the external stressors in a performance dog's environment. Although it is impossible to measure levels of stress, it is certainly possible to measure certain stressors


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