Answer:
In my life I must bare, my bloodline I must share. What am I?
Who plays when he works and works when he plays?
To you, rude would I never be, though I flag my tongue for all to see. What am I?
I help engines spin and pants stay up.
I am a nut with a hole. What am I?
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