This is not the type of behavior that should be dealt with via the internet in my opinion. I think you need to seek the help of a Dog Behaviorist, someone who specializes in large dogs would be best.
I think the reason he did not do this in his previous home was simply because he was too young. You better get him properly socialized before these traits are instilled in him. He is still young enough that it shouldn't be too difficult to redirect him.
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Ella - Jun '20 - Reg AmStaff
Squeak - '15/16? - Tabby cat (adopted Nov '18)
Streak - '18 - Black cat (adopted Nov '18)
Peewee - Jan '06 - 6.5 lb Chi (adopted May '09)
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Roxy - Feb '05 to May '20 AmStaff (adopted Jul '11)
Myka - Nov '98 to Jan '10 - APBT X
Lacy - Sep '92 to Jul '03 - Sheltie
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