Continued rescued 3 year old yorkie from a puppy mill,let me add a few things.?

There was alot of dogs taken in the seize.Not all were so lucky.The people had kids,ranging from real young to teens.The girls young and teen of the family played with them and loved on them.They were in large outdoor kennel pens.It was 1 male and 4 females in each,with seperate dog boxes.They've been working with all of the dogs and a few have been adopted out.Some had health problems,some were pregnant and waiting to either have pups or be spayed before adoption.All are being spayed/nueterd before allowed to adopt.Are being examined and given vaxines before leaving.They are working with them as far as interacting and socializing with humans before allowing adoption.They've already nuetered the one I'm getting,I've visited him a few times to let him get used to me.He acts unsure,not really scared just unsure.Once you start to pet him he's seems to be ok.He doesn't like to be picked up much.He already had a collar on,so he's used to that.He will lead but doesn't like it.He's not aggressive with his food,treats is another story.His hair is actually in fair shape.They gave him a puppy cut,he will have to have another bath though.I just wanted to know if anyone had any advice and had been in the same or similar situation.Or if there was anything with the yorkie breed I need to watch out for.And to add a comment to a earlier response,every dog should know true love,regardless if some humans don't,all my dogs know they are loved,and safe,sometimes I wonder if they still know their dogs,but hopefully with time this little guy will to know true love.All dogs deserve to be treated with care,love,kindness,understanding,comp… thoughtfullness,no matter their breed,age,gender,looks,bloodlines,and so forth.Its not the dogs fault,its the worthless humans that bred them or let them get in the unfortunate situation their in.