Sorry, forgot the (/sarcasm) tag. : )
The dog was obviously neglected and abused. Probably too terrified to do what she was supposed to do: protect.
No, the dog was more than adequate as a watch dog, as shown the next day when LE and other well-wishers and strangers began to parade through he house. The dog went frantic and jumped on each one, until it had to be removed.
Whether the noise it made was quite a "bark," exactly, it had no trouble making its concern known.