Aiming Hammer/dogs

[Guest7]

My game does not automatically center.
Using the hammer is becoming pointless.
What control setting for the mouse is the best for using the hammer---1.8 or higher or lower?
I read that if you get on top of crates, you are protected. In my game the dog just blasts away the crates and I am left on the ground.
I play on Easy and at times it switches to a harder Game play---why is this? Because when I go back to my saved games, some of them are Easy and some harder. I only want EASY.
If I can't get past the workarea, then what's the use in even trying to finish this game?
Help