Very interesting, Gozgals. Thanks for the info. So when, in relation to Sue Ann's disappearance, was her dog murdered? It wasn't the same weekend as she disappeared, was it? I can see Sue Ann being very upset by that if it happened just prior to her disappearance.
LButler - it may be a coincidence; it may not be. The Wal-Mart parking lot is right off the highway - there's not much else out there that's right off the highway and it's by far the busiest spot in the area (hence, no one would pay any particular attention to someone parking a vehicle there). And her van wasn't found until the Monday after the Friday she disappeared. Wal-Mart's video cameras recorded her at the store on Friday afternoon, but I don't think there are any cameras out in the parking lot where the van was left, so it's not known when the van was left there that weekend.
I wonder whether the husband would have acknowledged that Sue Ann was even at his house that Friday night if it weren't for Sue Ann's friend's account that Sue Ann was on the phone with the friend, waiting at the husband's house for him to arrive.