re: Homeless man refuses to move from woman's porch in Los Angeles

If it were my home, I would go down to the local dog shelter and volunteer to foster only Pit Bulls, German Shepherds, Dobies, or Rotties.

I would chain them with appropriate length chain (you know, just long enough to let him do his job) to the porch. If they did not do their job, they would go back to the shelter. If they did it well, they would eat/sleep like a king.

Lots of "Beware of Dog" signs help. When problem goes away, back to the shelter unless I fell in love with them (the dog, not the perp).