How do I get over the fence?

Hint 1 of 6:

The dog won't let you do it.

Hint 2 of 6:

You need to find a way to get rid of him.

Hint 3 of 6:

Did you notice the guard giving the dog some biscuits?

Hint 4 of 6:

If only you could get your hands on those biscuits.

Hint 5 of 6:

First have a chat with the guard.

Hint 6 of 6:

Knock on his window.