Neutering may not stop his marking but will certainly keep him from
getting your little girl pregnant. How about a belly band on him?
That will stop him from marking but will not stop him from getting
her pregnant when she's older. Humping should die down some
however they still do it from time to time. Buddy is six and the
only time he humps his bed is after breakfast
I tell him only
bad boy's do that daily and he walks away until the next morning
only to do it all over again. Your doing the right thing by getting
him neutered and hopefully the little girl spayed when she's older too.
Hope this helps you,