Sounds like this dog has had no socialization at all. I'm no chihuahua expert, I don't know anything about the breed at all, but that does not sound good at all. I know the few chi's I've come in contact with, they have either been very shy and shaking because they were so nervous, or they have been just real yappy. Is this woman a backyard breeder by chance? By 8 months I would think they would be used to people. The dog was probably real nervous about going with strange people, but something just doesn't sound too kosher with the whole situation. Poor pup, didn't even want to go back to the woman. I wonder how she was treating the dog! 