I have two Golden Retrievers one aged 13 and one 9, I also have a x breed puppy aged 8 months.  My problem is that if I walk the dogs together and let them off lead for a run the 8 month old will run at full speed into the younger GR, she doesn't bother the older one luckily.  This is now causing problems as the GR will not leave our sides if the pup is loose.  We have seperated them on walks, occassionally my OH takes the younger GR with him to work (he is a gardener) and I walk with the older GR and the pup.  I also take her to obedience classes and she has just started a puppy agility class, she works well and enjoys what she does.  We have gone through aggressive playing and having to have all the toys, the younger GR has never really put her in her place only snapped once or twice but it's like water off a ducks back with the pup.  The pup has been well socialised with other dogs and people and never acts like this with other dogs but will make a 'b' line for the younger GR if off the lead not to fight just to run into her.  Is this an age thing, will she grow out of it, any advice gratefully received.
Jan

It is an age thing, she obviously knows not to do it with the older female she probably just gives her one look and she knows she is not for playing with and is respectful, however the 9 year old is also too old really for this play and I doubt very much that she enjoys it but is just being the very patient big sister, it is affecting her though if she is just sticking to you on walks and not enjoying herself anymore.

So, whilst the pup is at this stage and if walking seperately is too much, perhaps you can get a long line for her it will still give her much freedom to run and play and meet other dogs but you can reign her in if she is being too bothersome for your 9 year old. The other action is to distract her from this play and try to get her to chase a ball or frisbee instead.

The joys of puppyhood. :-)

Thanks for that advice Carrington, I agree that seperating them on walks is probably the best action and we will continue to do that in future.  It has become sad to see my very sensitive GR becoming upset at what's going on and walks that used to be a pleasure are not so enjoyable, I thinks it's because of the GR's happy playful nature that has encouraged the pup to be the way she is, she has hardly even told the pup off and when she has done she has not been forcefull enough.  I am hoping that now she is doing a little more exercise and starting the agility she will start thinking more about that than GR bashing!!  I will take along some toys on our next walk when we are together and see if that helps.  I am also going to up the pups daily training I have currently only done 5-10 mins daily with her but perhaps now's the time to increase that. 
Thanks again
Jan

Yes, you can certainly up the anti on the training she is 8 months now and capable of much more.

You will probably notice in time that your 9yr old GR although tolerant up until now, once the pup is a little older she will not be so tolerant, it is funny how pups can get away with murder but once mature it is a different story. So don't be lulled into thinking it will always stay this way. Though knowing older GR's she will probably take it all on the chin. :-)