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.
Physical signs include enlargement of the milk glands which can be felt from about the 4th to the 5th week of pregnancy and distention of the abdomen which can be seen anytime from the 4th to the 7th week, depending on the size of the bitch and the number of puppies she carries.