
Hi Karen,
with the age difference I'd expect things should go pretty smoothly :) The only thing I've found is that it's important to dedicate some 1:1 time with your older dog so it doesn't feel left out. Puppies (as you'll know LOL) are hard work and VERY time consuming and its easy to find that we are no longer spending as much quality time with an older resident as before - usually because there's a limit to how many hours are in a day and how best we can juggle things ;)
Make sure that your older dog gets a bit of extra fussing throughout the day and doesn't miss out on regular walks or training - even if these realistically have to be made shorter while house training the puppy :)
One other thing, give the adult time out from the puppy too - sometimes they are happy to be around one another 24/7 but other adults can find pups tiresome after a bit (they feel those jaggy teeth too!)
Other than that I'd say you'll probably find there are no genuine hurdles to overcome - maybe a few tiny bumps but the dogs tend to work out those situations themselves. Mine are currently thoroughly enjoying the new addition
most of the time (although TBF one of them is his mum) but get a bit ticked off when he starts chewing their feet/legs/ears when they're over to me for a cuddle .....
HTH, Teri :)