Answer:
'He could feel the hound, like autumn, come cold and dry and swift
Step-by-step explanation:
Bradbury uses the simile of the hound like autumn in order to provoke sensations that are similar to the feelings we experience when Autumn is near and Summer is over.
The coldness and the swift character of the (mechanical) hound expresses the emotionless hunting of the machine in the shape of a hound.