Answer:
I know a word of letters three. Add two and fewer there will be. What is the word?
Angels and pilots work with me.
I stand in one place yet fill the whole room. I can be filled with molten rock and come in every hue. What am I?
What has feet and legs, and nothing else?
Tear one off and scratch my head what was red is black instead. What is it?
Those with eyes bigger than their stomach will definitely leave the restaurant with one of them. It is named after a house pet as well.