Sentence:  When Timothy and Julia hurried up the staircase to the bedroom floor, where a considerable commotion was taking place, Tim took Barry Leach with him. .... The captive made no resistance and came not only quietly but in a series of eager little rushes like a timid <WSD>dog</WSD> on a choke chain. 
Meaning of the word marked with <WSD> tags:  A mammal, "Canis lupus familiaris", that has been domesticated for thousands of years, of highly variable appearance due to human breeding.