Miss Sunshine was a dog that Drusilla adopted after killing her owner. Dru initially hoped to give the dog to Spike to feed on. However, Spike refused and Dru kept the dog as a pet for a while. Miss Sunshine was last seen in Drusilla's arms before Rupert Giles attacked Angelus in the factory. Considering that she was not seen after as the building was set ablaze, it's likely she fled.