Answer:
I run around the streets all day. Under the bed or by the door I sit at night never alone. my tongue hangs out waiting to be fed during the day.
I am a path between high natural masses; remove the first letter to get a path between man-made masses.
I am the reaction after enjoying soda.
I am one small little piece of paper yet sometimes hold lots of value. I am all you need to get in to big events but will cost you. I am an important part of travel. And if lost you're not coming.
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
A town has only two barbers. One of the barbers has a nice, tidy haircut, and the other has a shaggy, messy haircut. Which barber should you go to?