Lots of trainers have expertise with dogs who come with 'baggage' from their previous lives - in fact, I would consider this knowledge, experience, and empathy key to being a good trainer.
What is really needed is the ability to understand your individual dog - regardless of his or her background.
Lots of trainers do in-home consultations, too.
I don't know of anyone who focuses on the 'adopted dog' aspect of training, though.
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Honestly, unless you know of specific trauma that has impacted your pup's behavior, given your pup's age I would concentrate on getting your pup into a ZH certified Welpenförderung class ASAP. Your pup will be in a key social developement stage so the perfect time to start.
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One thing to keep in mind in all dog training:
You are the one being trained. 
Dog training classes are all about teaching you, because you will then be the person teaching your dog 24/7.
With that in mind, to help you prepare yourself.
Patricia McConnell's The Puppy Primer' is a good place to start. This is written for the first time owner, covering the basics:
https://www.amazon.com/Puppy-Primer-...=UTF8&qid=&sr=
Another resource is Emily Larlham, who has a series of free puppy training videos on her website, time well spent for the soon-to-be-puppy owner:
http://dogmantics.com
Also 'The Perfect Puppy In Seven Days: How to start your puppy off right' and 'How To Behave So Your Dog Behaves' by Dr Sophia Yin are fantastic introductions to being owned by a dog. These books are out of print but still available as an e-book.
https://www.amazon.com/Perfect-Puppy...4ZWEB9HRN3JZ6C https://www.amazon.com/Behave-Behave...R1PZDXD387XM1G
These trainers are/were among the leading voices in ethical dog training today. It's important that you read/listen/watch/work with trainers who are committed to ethical, positive training. There are still trainers out there who are not, including a couple of the big names. Any trainer who works with adversives or uses language from the dominance school is to be avoided.
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All the best to you and your puppy - it sounds like you, and soon the little one, are off to a great start in this new adventure.