Some people are convinced that dogs fear things by nature the same as they always bark on a postman. Nothing could be more mistaken. All these behaviours come from the smell of the certain place or person which dogs can sense and interpret. I was assisting the dog owners in their vet visit and observed their mistakes. Dogs were quite often paralysed by fear or fear was triggering aggression in them. I have seen dogs peeing or pooping from fear on the floor while waiting for a vet in waiting area.
All these places such as vet office or groomer room have specific smell that mainly consists of disinfectants. This type of scent is for every dog very stressful. It can be compared to our visit to a dentist and our fear associated with a tooth ache.