Hi Sharon,
One of my girls, who is also a 20# dog, had a small hot spot (about the size of a quarter) on her backside, and she would also run from spot to spot and then sit down quickly. In the house I was keeping a loose diaper on her so she could not chew or lick the area and I discovered she was more comfortable having the hot spot covered. When I took the diaper off, she would start the running and sitting again whether inside or outside. This behavior did not go away until the hot spot was completely healed and the hair was growing back which was around 3 weeks.
