Notice the police say the "suspect likely knew the family" . Isn't that common sense? I mean, you have to be really evil to do that to someone you don't know. Not that it makes it any less horrible, but who would think to do that?
Add one more argument for requiring every U.*. citizen over 18, (save those incompetent, unstable, or criminal), to carry a firearm of .32 calibre or higher at all times, and train with it at least four times a year.
The dog killer and the the guy who robbed the old lady both need to die.
Preferably, their death will be squishy.