Answers: runny nose that is to say green is most likely cause by a bacteria.
which can be smoothly treated by antibiotics
runny nose to be precise clear, is caused by a virus.
these lately heal by themselves, but if they last more than a week, go see a doctor, they might precribe Acyclovir. (anti-viral)
If your runny muzzle isn't clear, then that vehicle you have some type of infection and you'll stipulation antibiotics. ;)