Answer:
Canine children.
I take off my clothes when you put on your clothes. I put on my clothes when you take off your clothes
My first is in riddle but not in little. My second is in think but not in brink. My third is in thyme but not in time. My fourth is in mother but not in brother. My last is in time but no t in climb.
I am one with eight to spare, lest I lose my one. I'm not a number. What am I?
You throw away my outside, you cook my inside. Then you eat my outside and you throw away my inside. 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