Yeah man, hit me up with private message or even through this thread. I am sure that through the lot of us there will be many good tips!
As
@ArtPeur just wrote, puppies at that age often seem scared. Don't forget that she was taken away from her mother and siblings and that she now has to get used to living with humans. Just like a child, their brains are creating myriads of synapses trying to adapt to you in a "unnatural" way for them. Fortunately, millenias of domestication has breed dog that are very docile!
Still, some dogs aren't 100% clean until up to 6 months! It's part of the joys of being a dog owner
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Anyway, positive reinforcement is always a good way to have them do shit, so if you want to steer them somewhere, treats are the best. You guys already have good reflexes. And also, dog training tips found on google are surprisingly good by the way. My lover would just search for quick tips and even what she found in French was pretty decent. And let's be honest, at the end of the day, dogs aren't really complex
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One thing that is also important in my opinion (and it works when done well), is knowing when and how to punish your dog. Of course, yours is still very small so you can't really rely on this training method for now. But when she gets sturdier, you can start raising your voice and even gently but firmly physically constrain her. What is very important is that you can only do that when you catch her doing something wrong. Dogs have very short attention spans and you can't punish her 1 hour (or even a couple minutes to be honest) after the fact. Even better is when you have evidence of her crimes.... you can shove it on her nose while raising your voice. I know that this is not something that everyone will agree with, but it has always worked for my dogs. Just don't hurt them.
Anyway, it looks like you already are doing good after such a short time with her. I think you guys will do just great!