https://phys.org/news/2018-05-canines-born-summer-prone-heart.html

"This finding is significant because the canine heart is a remarkably similar model to the human cardiovascular system," said lead author Mary Regina Boland, an assistant professor at the University of Pennsylvania.

The fact that humans and dogs live together and are exposed to the same environmental impacts point to a common source for the heightened seasonal risk, she told AFP.