Hi Candy..
What a shame.. It really makes me sick to hear about animals not being treated right. I found myself wandering into our SPCA yesterday, They have so many dogs and cats there it is sick...
Anyways, I think you need to follow your heart. (That is something the breeder told me to do about my so called friend re Presley) You and only you know what is best for that pup. If taking him back is what you have your heart set on then you do that. Personally it is a bit shocking to hear that he has bitten her son. Maybe he did so with good reason? The thing with the frosty paw could be because they just didn't let the dog know it was ok to take food away and so on... Presley could be eating the most wonderful thing and i can come along and take it from her and she wont do a thing... I want her to be like that.. She can't think she rules over me and attack me because i did something she didn't like. Maybe these people do need some help.. But please Candy do go with what your heart says. If things don't look good around there then take him home to a loving family who will help him and Feed him and Train him.
44 pounds..WoW... Well we both know what Presley weights
I think she was 44 pounds around 4 months.. more -->
Oh well all i can really say is my girl is happy and healthy and that is what is important to me
I will always do as my heart says for now on.. My heart told me long ago not to leave her with some people and i did for my own selfish reasons...
Anyways, Take care and goodluck with that puppy... If things look ok try and talk to them about the food too.... If they are not accepting of the talk then i think you know what is best for him.

take care
Melissa & Presley