Ara is a creature known in her world as a fire dog. In this world, Fire dogs are former fire spirits that have been largely domesticated by humans and thus lost a majority of their "spirituality" i.e. their ability to control and create fire. However they can still release their flaming potential until they are completely domesticated into the average dog that we know in our world.
One might wonder why fire dogs risk becoming normal, stupid animals, but to them, the answer is simple: Humans are their companions, and they will always be loyal to them, even until the death.