When you gain a pound of fat, your body makes seven new miles of blood vessels. This means your body must work harder to pump blood through all of these extra new vessels, which may put a strain on your heart, and may reduce oxygenation and nutrient replenishment in other tissues.
Panting is a sign that your dog is excited, hot, or both. But panting is also a warning sign. If your dog is taking a break from exercise and continues to pant heavily, this could be a sign of heatstroke â a medical emergency. Move your dog to a cool spot or indoors immediately.
Also, the brachycephalic breeds (dogs with a pushed-in face such as the pugs, bulldogs, Boston terriers, etc.) are prone to excessive dog panting because of their small nasal passages and short windpipes. They need to work harder (pant more heavily) for heat reduction.eat Stroke. Heat stroke is perhaps one of the most common causes of heavy dog panting that can lead to devastating damage to the dog's physical health. If a dog is left in a parked car on a hot summer day, or has been out playing or running for a long time in the heat, he can easily get heat stroke.