Answer:
A trail, a union, together tied. Come across me and you will find you cannot change the course I'm on. Without me you cannot travel on. What am I?
My first is in fish but no in snail. My second is in rabbit but not in tail. My third is in up but not in down. My fourth is in tiara but not in crown. My fifth is in tree you plainly see. My whole a food for you and me.
I like to twirl my body but keep my head up high. After I go in, everything becomes tight. What am I?
What kind of cheese is made backwards?
I don't live within a house nor do I live without. Most will use me when they come in and again when they go out.
What scientists might call your pooch.