Answer:
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
If you have it, you don’t share it. If you share it, you don’t have it. What is it?
I'm written with two letters, said with one and seen with two. What am I?
you hold my tail while I fish for you
What is black when you buy it, red when you use it, and gray when you throw it away?
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk