why do dog like to sniff butts

Question: why do dog like to sniff butts
- Keywords:
  animals,
  butts,
  dog,
  sniff
Asked by georgie1 to Helen on 13 Jun 2011.
- Helen Fletcher answered on 13 Jun 2011:
  
  Hi georgie1. Sorry, dogs butts aren’t my area of expertise. But next time a meet a dog butt scientist I will ask him for you!!

Question: why do dog like to sniff butts