Rosea's this big fluffy canine thing, let's say something the size of an Arcanine.
She was supposedly meant to be a war dog of sorts, serving as a knight's mount in the army,
but timid as she was, she didn't really do well in warfare, and was sent away.
Eventually an old couple found the poor girl alone near their farm, and took her in as part of their family of barn animals.
Bearing strong build, she helped doing the heavy work, (like, stuff normally done by a horse? or a donkey?) and ironically, in guarding flocks.
Contrast to her personality.