National Report — They combed through more than a million tons of hazardous debris covering 16 acres with nothing more than a nose to the ground
in the days after the Sept. 11, 2001, terrorist attacks on the World Trade Center in New York City, while their human counterparts
were outfitted in protective gear.
A decade later, about a third of the search-and-rescue dogs remain—most showing little evidence of ill health despite the
prolonged exposure to toxic fumes from the pile. To the contrary, many of the responders who worked at Ground Zero are still
plagued with physical ailments and psychological scars from the tragedy.
"It's amazing, because the dogs have done remarkably well," says Cynthia Otto, DVM, PhD, associate professor, research director
and associate chair for research in the Department of Clinical Studies at the School of Veterinary Medicine at the University
A bright spot on a dark day: Brought to Ground Zero in the days after 9/11 to help find and recover human remains, Otto says
the search dogs did much more. (Photo courtesy od Dr. Cynthia Otto)
Otto has been tracking about 100 of the search-and-rescue dogs called to duty after 9/11. The American Kennel Club's Canine
Health Foundation began funding the project in January 2002. Her study involves 97 dogs deployed to the World Trade Center,
the Pentagon, and the Staten Island landfill where the World Trade Center debris was taken, and 57 control dogs. The control
dogs are search-and-rescue dogs of similar ages and breeds that did not work the post-9/11 cleanup, Otto says.
Each year, the deployed dogs participating in the study are examined by their veterinarians. They in turn send blood samples
and chest X-rays to Penn. Also included in the annual update are surveys on behavior and general health that are completed
by the dog's owners. If a dog dies, a necropsy is performed and the ashes of the dogs are returned to their handlers, Otto
Death and cancer rates in the deployed dogs are roughly the same as in the control group, and there are no signs of respiratory
disease, Otto says. Though two more dogs died the week she was interviewed, Otto says the deployed dogs most often succumb
to old age—not from problems related to their work after 9/11.
"It's not like these dogs are dying young," she says, adding that most live to 14 or 15 years of age.
"They're phenomenal dogs. There's a smattering of health issues, but not what you would expect," she says.
One of the only health differences noted between the control dogs and deployed dogs was an increased chance of heart irregularities,
"That was unexpected, so we are watching that closely," she says. "They are not physical problems, per se, more radiographic
In fact, radiographic cardiac abnormalities were significantly more likely to be diagnosed in deployed vs. control dogs, Otto
reports in the Journal of Environmental Health (Sept. 2010). "Of the seven dogs with cardiac lesions, five had mild left-sided cardiomegaly with atrial involvement, one
had right-sided cardiomegaly, and one had mild generalized cardiomegaly," she states.
Otto says a study of dogs in Mexico City indicates that enlargement of the heart is a condition that could be triggered by
environmental pollutants. "Maybe exposure to the toxic chemicals in the air at Ground Zero set those dogs up for that, but
there's no way to say for sure," Otto says. "There is no hard evidence yet."
The study is revealing a lot about the aging process in dogs, as Otto explains there have been few opportunities to follow
this number of dogs so closely.