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Why Dogs Born in Summer Likelier to Get Heart Disease

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By HealthDay News

Dogs born in the summer are at higher risk for heart disease than pups born at other times of year, according to new research.

Scientists think exposure to outdoor air pollution may be to blame.

Researchers at the University of Pennsylvania's Perelman School of Medicine analyzed data from the Orthopedic Foundation of Animals on almost 130,000 dogs. In all, 253 breeds were represented.

Certain breeds not genetically predisposed to heart disease were at highest risk. They include the American Staffordshire terrier, English toy spaniel, Bouvier des Flandres, Border terrier and Havanese. Also at added risk: dogs that are often born in July, such as Norfolk terriers and berger Picards.

Overall, dogs have as much as a 2 percent risk for heart disease, depending on their breed, according to the study published recently in Scientific Reports.

But dogs born between June and August have higher odds for heart trouble. Dogs born in July have a 74 percent greater risk than expected based solely on breed, the study authors said.

Since the link, which couldn't prove cause and effect, was independent of dogs' genetic risk for the condition, researchers say environment probably is a factor.

Other research has shown that fine particle air pollution, including that from factories, peaks during summer months. For dogs and humans alike, exposure to outdoor air pollution during pregnancy and birth appears to contribute to heart trouble later on.

In people, exposure to outdoor air pollution before and during birth has been linked to later development of an abnormal heart rhythm, the researchers said.

Canine pregnancies last just two months, the researchers said. But, they added, dogs may inhale air pollutants while pregnant, which could affect developing hearts in their unborn pups.

"It's important to study dogs because the canine heart is a remarkably similar model to the human cardiovascular system," study lead author Mary Regina Boland said in a university news release. She is an assistant professor in biostatistics, epidemiology and informatics.

"Also, humans and dogs share their lives together and are exposed to similar environmental effects, so seeing this birth season-cardiovascular disease relationship in both species illuminates mechanisms behind this birth season-disease relationship," she added.

More information
The ASPCA provides more on heart disease in dogs.

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Health - U.S. Daily News: Why Dogs Born in Summer Likelier to Get Heart Disease
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