my thirteen year old dog does is very unfriendly to my daughters yellow lab puppy

Question
My mutt dog weighs about 25 pounds is 12 years old-not used to other dogs-is housedog-has gotten lots of attention and is spoiled.
My married daughter got a yellow lab puppy-puppy now is about nine weeks old-still smaller than my mutt dog. My dog wants nothing to do with the lab puppy. My daughter frequently brings the lab puppy over-we would like to see them play together. My dog wants nothing to do with the lab-we have kept them separated for we do not want the lab puppy to get hurt.   Soon he will be bigger than my mutt dog. what suggestions would you have-the lab probably comes over for a few hours 4 x a week. We have tried to have our dog held by us and given attention while our daughter gives the lab pup attention.
any suggestions

Answer
This is a problem.  Our Lab, Aster the grouch, turns 12 next month.  She came to live with us 2 years ago.  We have presented her with a new puppy twice and will again soon.  Besides that, our daughter visits sometimes with their now 8 month old German Shepherd, and we puppy sit a for friends at times.  At our last visit to the dog guide school, the president spent some personal time with us talking about how older dogs see no need for puppies at all.  

Until they mature at about 3 years old, most dogs enjoy biting and chasing games with each other.  They also expect us to enjoy being bitten.  Older dogs just don't care for it, especially once old enough for some arthritis to set in.  Best thing to do is to support the older dog's warning barks and snaps.  The puppy can be trained to leave the older dog alone just as you need to be persistently working at training him not to bite you.  Most Lab puppies require many corrections to quit biting.  Usually none of it comes to actually ingeries.  

Young Labs, which I know best, and other puppies tend to very bad about
biting.  You see a litter of them, and all the ones that are awake are biting
another one or themselves.  I am not even sure they realize that when they are
alone, if they quit biting, they would quit being bitten.  At 3 to 4 months
they are getting their adult teeth, and it seems they spend every waking
moment biting or chewing.  I maintain a Lab's favorite chew toy is another
Lab.  Otherwise they settle for any person they can.  They keep hoping to find
one that won't yelp and jerk their hand away, or growl "Bad dog." and clamp
their mouth shut.  Then offer a chew toy.  They keep trying despite hundreds
of corrections.   Another good technique is to quit playing and go away.   Be
sure to praise them when they are playing nice and not biting.

You just have to keep on correcting them, hundreds of times, not dozens.
Provide sturdy, safe toys such as Kongs and Nylabones.  Avoid things they can
chew pieces off and choke on them.  Keep them away from electrical cords.
Crates are essential for most young Labs and other dogs.

The pet stores are full of toys that many dogs will quickly chew up into
pieces they could choke on or cause intestinal blockages.  If you are not
there to watch, stick to sturdy stuff such as Nylabones and Kongs.  Keep a
close eye on chew toys and quickly discard anything that is coming apart in
pieces.  Rawhide is especially bad because it swells after being swallowed.
These problems are the worst with, but not limited to, large, aggressive
chewers such as Labs.

Ropes from the pets' store quickly turn to hazardous shreds.   Ones I made
lasted much better.   Go to a hardware or home center that sells rope by the
foot.  Buy 2' of 3/4" poly rope.   Melt the ends, and tie  knots in it.   Get
them as tight as possible, put it in a vise and pound it with a hammer.  Watch
carefully, and be ready to discard when it comes apart.

It is easier if you separate the dogs.  We have a gate to deny the puppies access to much of our house.  Sometimes Aster will accept being exiled to the living room.  Better yet if somebody is at the computer in that room.  We do that more when we have extra hellions visiting.  You are correct, that the older dog does need the reassurance of plenty of attention.  

I think it helps when the younger dogs are allowed to play with other ones.  They need to be carefully selected ones with all their shots.  Even the the most aggressive shot program has a window where a puppy can pick up parvo or other diseases.  This is part of the reason why we are generous when somebody asks us to keep their puppy.  Over Labor Day when we had 3 puppies, we let Aster go visit somebody else.