They keep them in a well insolated crate. At every stop they give them a bowl of food and water and change the paper if it was used or shreded. They take really good care of them.
Most dogs do this. Nobody really knows why. but, it could be because he/she is tracking a scent. Humans skins have pores by which perspiration takes place to control the body temperature by giving...
sending a dog in a plane is a bad idea. they can get really sick and meet a horrible death. car rides may be better as long as its not like a million miles away. cars probably are the best way. but...