I haven't told the worst part yet.
When we got back, I saw what I think was the momma dog looking for her lost baby...she was running frantically from the trailer, to the fence of the house next door, and all around the area, sniffing and barking as if she was calling for her baby. She was a hungry, scruffy street dog who seemed to have an injured rear right leg.
So that means there are probably other puppies somewhere in the area, perhaps in the back wooded area behind my house. I'm afraid to go looking for them, and I feel just terrible about the mama dog looking for her baby.