Dangerous? The only thing really inherently dangerous about that cross is that they will be big dogs, and will need to learn manners to prevent them from accidentally hurting someone by jumping or bumping into them.
You might have a bit of trouble with some things, like bite inhibition, because he left his littermates and dam so early, and missed out on some valuable social lessons.
For house training, he needs to go out
much more frequently that every two hours. The general rules are: out after waking up from a nap, out after eating a meal (which at only five weeks, should be at least four times a day), out after taking a drink, out after he's been playing for a bit, out any time he looks like his starting to think about pottying (sniffing, circling, etc.), and out every twenty minutes of so just because. Also, out any time he wakes up during the night. If you aren't going to be right on top of him, watching like a hawk, then he should be crated or otherwise confined.
This is an excellent online puppy class that covers a lot of territory on basic skills and exposure to the world. It starts on February 1st, and enrollment is open now.
Fenzi Dog Sports Academy - FE115: Baby Genius