If my dog wouldn't eat to the point of emaciation I would be forcefully syringe feeding him kibble mush. Renee those vet techs pleaded for your dog to go to a home where she might fair better. What would you think of them if they'd just left her like that in the back room, without mentioning her to anyone who could help? It really does sound like Teal just had to call the breeder and it would have been sorted out.
As was already mentioned, it seems the fila pup started gaining weight crazily the moment it was removed. Despite the stress of being emaciated, vetted, transported, it started eating and gaining immediately. You could be right, that the pup just wouldn't eat. To me, it points towards a lack of food issue.