HartsfieldâJackson Atlanta International Airport has been the world's busiest airport every year since 2000; with all airports combined London has the world's busiest city airport system by passenger count.
Tension or Temperature. Dogs may shake as a way of relieving tension. If a dog is feeling nervous or uncomfortable in a situation, it might shake the whole body as a way of shaking out tension. This behavior also may function as a means of getting attention from other dogs or people.
Hypothermia, Heat Stroke, Fever. Dogs shiver when they become hypothermic due to extremely low temperatures. They may also tremble and shake if they are overheated. This is generally accompanied by labored breathing, a bright red tongue and pale gums as well as vomiting or diarrhea.