Help remembering horror title

Hey guys! :)

I just registered on these forums and I'm a huge horror fan.

Though, I'm trying to remember the name of this horror movie, I think it's made between 2002 and 2005 sometime, and the plot is that some boy/youth killed his mom, dad and his dog with garden scissors I think, and used the dogs face as a mask.

And as every other horror movie out there, a group of teenagers go to the abandoned house to take some pictures and stuff, and the rest is self explanatory. :p

I really hope you can help me, I've been looking for it for ages. :O