Answer:
I'm white, I'm round, but not always around. Sometimes you see me, sometimes you don't.
The itsy bitsy teeny weeny yellow polka dot variety is quite popular.
I'm not man's best friend, I'm their enemy, I can mark your end, yet you do not see me, I am very small, but very tough, If you have me, then you have it rough.
When they are caught, they are thrown away. When they escape, you itch all day.
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
People take me on walks and I run and have fun. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?