Yappy Dog

What is the deal with that little yappy dog next door? He rarely comes out. Sometimes I see a big van come over and two womens take him in the van for a while. (Is there food in there?) Sometimes his Mom lets him walk around in the backyard. Then she picks him up like a toy and carries him in the house. But mostly, I just hear him, day and night, yapping yapping yipping yapping. What the *#&$? It wakes me up sometime when I'm getting a good 2 hour nap on. What could he possibly be barking at all the time? I think that quite possibly he is retarded.