Answer:
I produce wool and spit a lot
An action done on mosquito bites
I walk on 4 legs in the morning, 2 legs at noon, and 3 legs at night. What am I?
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
I regularly change shape yet remain a sphere. I am always there but not often seen. What am I?
A little house full of meat, no door to go in and eat.