Pet Adoption Doesn't Work

I had the same problem, the adoption agent came and set down the carrier but with no dogs appearing. I then searched through the entire house and discovered that the dogs were in my basement (first floor actually, but I only use the second floor for living) which didn't have doors or lights so I couldn't even see them in the dark if it wasn't for the windows. So I had to place a door and lights to get through them and then adopt.
Maybe some of you had the same problem, that the pets actually appeared somewhere else in the house.