Answer:
I am an activity dogs are very good at when a ball is thrown.
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
I have a mouth on my head and eat everything.
I twist and turn and leave a loop. What am I?
Roast, boast, coast, post. What do you put in a toaster?
What kind of dog has no tail?