The dog has strayed far from the 'Theory of Evolution'.
The dog outwardly worships a master, in all its domestic postures and mannerisms. In this worshipful state, the do further learns his master's language, obeys his commands and judges his master's moods and intentions, yearning always to be closer to him.
Pleasing his master brings great joy to the dog and rewards from the master. Conversely, the dog feels terrible when displeasing the master and shows outwardly all it feels. No secrets.
But, if the dog is cast out and cannot create a worshipful relationship with man . . . it instead reverts to its animal state. A scavenger pack member, loyal only to the desires of the pack. The only way it can survive.
Ruled by the pack's ruthless forces. Dangerous to man.
As are fallen dogs, so is fallen man.