He has been acting like there is a girl in season in the neighborhood. My guess is that it is the next door neighbor's dog.
Yesterday he gave us a scare though vomiting up some blood and bile. So off we rushed to the vet and while we were there I asked them to check out a new lump I had found. They asked the basic questions about his behavior and such and really he has good energy, good appetite, normal bowel movements, absolutely nothing that would tip off that he is feeling off except that morning he wasn't holding his tail quite right.
The good news about his stomach is that the ultrasound showed it is just a case of some general gastritis and should clear up with some pepcid and a few days of bland diet.