Answer:
I can be as thin as a picture frame but my insides have many things you can see.
A tasty reward given to well behaved dogs and kids
It is in every mountain, it's not in any hill, it's not in all the world, and yet it's in the mill.
When this is found in a road you are forced to make a decision.
What has a head and a tail but no body?
How did the farmer find his wife?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?