Someone once told me, at 12weeks dont take out your dog to the dog park, they can attract diseases from other dogs.. at least thats what he said :P
I feel really bad about crixus
but when we first got shadow, we went straight to basic commands. Did you try that? I am not much of an expert, but ill try helping
.. build a relationship with your pup, make yourself his leader.
You say he is really hyper? Maybe thats why seeing pash he kinda jumped and barked... a LOT!
Goodluck with crixus