I honestly don't see what that has to do with anything. The puppy shouldn't have been under stress - he was in a home where he'd been for quite some time (so one would assume there was little stress) and he clearly had no problem eating in an entirely new place if he gained 28 pounds in two weeks.
Do you really think so? This photo looks ok to you? (I'm not trying to be snarky and I'm not trying to pick on you personally, I'm really wondering if you think this is acceptable.)
Not as a vet tech, but as someone who has raised Filas and helped with rescue:
It's entirely possible that a Fila pup who has bonded would mourn and refuse to eat after being separated from their person,
but it's not going to happen in a matter of a couple of days, and, honestly, they are such survivors that it's unlikely those instincts, particularly as pup, wouldn't kick in and get them eating, and, from the later photos by the breeder he's thriving now. Thankfully. There is also that Fila metabolism -- the one that enabled the breed to survive in an extremely impoverished region on far less than ideal rations for unknown generations.
Does that mean Teal purposely starved him? Not necessarily, and, frankly, that doesn't really add up for me.
It's entirely possible that he started going downhill with Teal because she did not have the bond with him and he felt emotionally rebuffed. I know it sounds nuts, but it's the truth. It's how these dogs are. They are creatures of extremes and there is nothing as important to them, even from their earliest stages, as their people. That's one of the reasons it's so important to make sure you are ready for the depth of commitment necessary when you take a Fila puppy home. What will cause another puppy frustration, but will be forgotten in a few moments will break a Fila's heart.
Is the Fila puppy in this photo way too thin? Yes. Absolutely. Is there neglect? It would appear so.
Does that mean it was done purposely, out of malice? Not necessarily. I don't know, and looking at her other dogs in the photo I have to ask why would someone purposely abuse one puppy?
And why would you take photos of the puppy you were purposely abusing/neglecting?
Why would you post openly about sending him back to the breeder if you were purposely neglecting/abusing the pup?
It does make me feel extremely sad, to think of him feeling so bereft, seeing the anxious expression on his face in that photo. The best thing that could have happened was for him to be returned to his breeder.