let them be. they need to sort out their positions within youtr home. never meddle with them unless there is a chance they wont stop. dogs have their own rules and are not always visible to our eyes. theirbehavior is normal and if the pup goes to far the female will correct it. this may go with a lot of noise but wont mount to any injury. the more you fuss about it the more unclear their relationship will be and the more fuss they will show. there needs to be a clear dominance between them and that is something they must sort out. when this is settled the peace will return within your home!