One Good Dog by Susan Wilson
The very definition of a hard-nosed businessman, Adam March has no room in his life for anything but the drive to succeed. Not for his social-climbing wife or his rebellious daughter. Then, in an instant, he loses everything. Due to a collision of arrogance, stress, circumstance and momentary loss of self-control, Adam finds himself alone, unemployed and bussing tables in a homeless shelter. Chance was born in an inner-city cellar, a mix of pit bull and God-knows-what. Bred to fight, he lived in a dark vicious world. When the moment presented itself, Chance made the most of it in a new life on the street. Thrown together, Adam and Chance fill the holes in each other's lives. Adam gives Chance his first real home, while Chance gives Adam a new start...And a new heart.