Most apartment buildings have somehow acquired a volunteer guard dog. Usually this was a homeless, hungry, tired, and dirty dog that hung around until some apartment dweller took pity on him. They gave him something to eat, tidied him up, took him to the vet, and if he was lucky, the person built him some kind of shelter outside near the entrance. He rewards them by barking at any unknown person, but is wise enough not to bark endless in order not to lose his happy home.
Such is the case with this dog. He goes by various names and responds to all. He's been around quite a while. When it's his time to leave his post forever, I hope he will be lucky enough to have the dwellers thank him like they did for MEDA.