Answer:
I am slow and carry my house wherever I go but I am not a turtle. I leave a slimy trail behind me. What am I?
I quack and have webbed feet. What am I?
What asks but never answers?
What kind of dog keeps the best time?
A pony trots his way through the world on these.
You use it between your head and your toes, the more it works the thinner it grows.