Answer:
I work when I play and play when I work. What am I?
We applaud if you perform well.
I am the only thing that place today before yesterday. (one word)
I am the noise Santa's reindeers make
Weight in my belly trees on my back nails in my ribs feet I do lack.
Those with eyes bigger than their stomach will definitely leave the restaurant with one of them. It is named after a house pet as well.