old doy & new dog

Question
QUESTION: We have a 6 year old rotti who weights about 125 lbs.  We recently purchased a 9 month old lab.  As far as getting along the rotti seems to tolerate the lab.  My question is how far do we interfer when it comes to the lab mounting the rotti. The rotti is neuterued and the lab is not.  Do we interfer or just let them figure it out for themselves.  By the way we just got the lab 2 days ago.  They are both males.
Thanks for any info.

ANSWER: Perhaps the best thing to do is go ahead and get the Lab neutered too.  Let me assure you there is no lack of breeding stock.  Then let him know he is competing for second place by giving them both good leadership.  

The key to most behavior problems is approaching things using the dog's natural instincts. Dogs see all the people and dogs in the household as a pack with each having their own rank in the pack and a top dog. Life is much easier if the 2 legged pack members outrank the 4 legged ones. You can learn to play the role of top dog by reading some books or going to a good obedience class. A good obedience class or book is about you being top dog, not about rewarding standard commands with a treat. Start at http://www.dogsbestfriend.com/ For more on being top dog, see http://www.dogbreedinfo.com./topdogrules.htm

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QUESTION: aside from having the lab neutered should I stop him from mounting or let them work it out themselves.  Neutering is not something that will happen tomorrow.
Thanks.

ANSWER: I guess i missed that point.  If it offends you, stop it.  Otherwise, let them sort it out.

---------- FOLLOW-UP ----------

QUESTION: Thanks for getting back to me.  My last question, for now is we also have a tenant who has a boxer (also neutered)and is much more aggressive (not like the rotti who is calm), how should we introduce the lab and boxer?
Thanks again

Answer
I don't know that the neutral territory makes that much difference, but it couldn't hurt to meet away from both places.  Even half way around the block from different directions.  Keep both dogs leashed.  Let them do their sniffing and bumping.  correct them if either starts into low, rumbly growls or raises its hackles.  If all seems OK, return to the house together and see if they can be loose together.  it may or may not be OK.