Spike's doghouse is located in the left corner of the house in the backyard outside, but in the 7 Voyages of Cynthia level, after Angelica discovers Cynthia is missing, Spike's doghouse is gone in the shot of Tommy and Chuckie talking before Angelica stops them.
In the Pickles's home main level, Angelica's doll Cynthia is on the floor but when Tommy goes to the 7 voyages of Cynthia level, Cynthia is suddenly on the bed once Tommy grabs her.