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.
Some puppies should not be put on the electronic pet containment system until as late as five months of age or later. All puppies go through a fear imprint stage from approximately six weeks to sixteen weeks of age. Any thing that could psychologically damage a puppy during this time can affect it for life.