OK, so the image above doesn't actually have Henrik Larsson in it, or savage dogs, which might make this all seem a bit misleading, but it's not. I promise. You see, that picture is actually of Henrik Larsson's son, Jordan Larsson. The elder Larsson is manager of Helsingborg, and the younger Larsson is a player.
Helsingborg just got relegated from the Swedish first division. The above picture is of Helsingborg ultras running on the field and trying to rip Jordan Larsson's jersey off.