Answer:
I never was but always will be. No one ever saw me but everyone knows I exist. I give people the motivation to better themselves everyday
My keepers feed me colored balls. With sticks they store on my den walls. Sometimes I store them in my pouch. Sometimes deep in my belly; ouch!
I am merry creature in pleasant time of year as in but certain seasons I sing that you can hear; And yet I'm made a by-word A very perfect mock; Compared to foolish persons And silliest of all folk.
I am filled with garb the price is free. Just return what you don't need.
Santa shakes his belly like a bowl full of me
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