A female side protagonist

Sunshine is a delicate, small, white female Maltese with long, glossy, thick, silky fur, a little black button nose, round, tiny, dark, black button-eyes; small teeth, short legs, small paws, a fluffy head and a knotted, tangled, bedraggled, fluffy tail.

Sunshine is a kind, hopeful she who is fairly emotional and hysterical at times.

She was originally a leash dog. 

I can imagine her voice being high pitched yet caring.