Urban Dragon

Rosario Hernandez doesn't ask for much. She'd like to sleep on a bed instead of a sidewalk, to know where her next meal is coming from, and maybe, if she's really feeling optimistic, to get a girlfriend. More than anything, though, she wants her best friend Arkay not to murder anyone- because Arkay is a dragon, claws and all.
But the world is a dangerous place for a pair of homeless women, even if one has scales and claws. Arkay is doing everything she can to keep Rosa safe, but with every fight, Arkay becomes more ruthless and brutal. And Rosa is losing her grip on her dragon.
Urban Dragon: Volume 1 includes the first three stories in the Urban Dragon series:

Book 1: Mark of the Dragon
Book 2: Shadow and Steel
Book 3: Dance with the Devil