Why does Fluffy jerk her legs while she's sleeping?

Many an owner has glanced over at their sleeping pet and seen them jerk their legs or twitch their feet. Sometimes this jerking motion is so pronounced that owners become alarmed that their beloved Fluffy is having some sort of seizure. Generally speaking, this "running in her sleep" probably reflects Fluffy's instinct to chase as manifested in her dreams.

Why does Fluffy pant?

The thousands of sweat glands all over our bodies enable us to cool ourselves down by sweating. In contrast, dogs only possess efficient sweat glands on their feet. They therefore rely on panting as a means of regulating their body temperature. If Fluffy begins to overheat, she opens her mouth, extends her tongue, and begins rapid, heavy panting as a cooling mechanism.