Dogs only sweat from the bottoms of their feet, the only way they can discharge heat is by panting.
If a dog has its tail raised it is showing a sign of dominance. Napoleon Bonaparte, great general and conqueror, was affraid of cats. He would not stay in a room where there was or had shortly before been a cat. The reason a dog curls up with its tail covering its nose is to keep it warm during cold weather. In hotter weather they tend to stretch out to get rid of the heat.