Answer:
I am a sound made by felines when petted.
I am a protector. I sit on a bridge. One person can see right through me while others wonder what I hide.
I have a straight back and sharp teeth to cut objects.
You went into the woods and got me. You sat down to seek me. You brought me home with yourself because you couldn't find me. What am I?
I am made of wood but can't be sawed? What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?