But most martial arts have real world applications though, though ground fighting is something that should be avoided as much as possible, because asphalt + possibly glass shards is not a good combo for your health.
Why do dogs sniff? Dogs sniff to identify, for the majority of cases it is to sniff whether or not there is danger. A dogs sense of smell is much greater than that of a human being and it can smell things from a further away distance than many other animals as well as humans.
If a dog is dragging his behind on the ground it usually means his anal sacs are full. They usually need them drained if they are full, if left untreated they can become impacted and even burst, if that happens surgery would be necessary.