The Pride of Chanur (Chanur, #1)

When Tully, a fugitive from a spaceship captured by the arrogant, thieving, rodent-like Kif, takes refuge on the Pride of Chanur, a merchant vessel belonging to a clan of the lion-like Hani, Pyanfar Chanur, its captain, gives him shelter, in spite of all the dangers she and her crew will face.