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.
Even transient situations can cause you to have a startle reaction. The blare of a car horn, a child with a deep cut or the sound of someone falling down stairs can leave you shaking for quite a long time. People with bipolar disease and other depression syndromes often experience inside trembling.