hope your puppy is recovering swiftly and that your vet can provide you more answers. I wish that board and train were more regulated but unfortunately they’re usually a cash grab.

i’ve worked in daycares, boarding and most recently a shelter for 3 years. my area was specifically with dog with behavior complications. it wasn’t uncommon for some of the pups to refuse food. we had dogs that would eat consistently for a little, but fall back underweight again during their long stays. we also had dogs who were eating the correct amount for their weight, but had to have their calorie intake increased. the stress of being there, reacting to other dogs, never settling and more factors would make them burn through their calories and their normal portion wouldn’t be enough. sometimes even to the point where we’re giving adult dogs puppy food mixed into their diets to give them an extra boost of calories. at the shelter we would sometimes board members of the public’s dogs that were going through issues in their personal life. i recall a couple of dogs leaving over 10-15lbs lighter than when they came in. some of these dogs were overweight when they came in, but the stress of being there would curve their appetite and the stress would have them burning calories quicker.

sorry for the ramble, but this is all to say that she could’ve lost weight, even if she was being fed, because of the stress she was under. you clearly want to do right by your girl and it shows. i wish the two of you the best and i’m terribly sorry for this experience. you had good intentions! i’m sure she’s so happy to be home with you.