I have a 9 week old Border Collie x Blue Healer.. Whilst my fiance and i are at work, he stays at my future parents place with their older dog Georgie. Pathc (my pup) teases him, races after him and even pinches his toys and runs in front of Georgie as if to say, 'ha, i got it'. Georgie does growl and sometimes even chases Patch away, but has never bitten Patch.
We found, leaving the George in another room when Patch first arrives each morning for half an hr helps George accept Patch is there for the day. They get on ok. They even sleep together on the couch now.
Having an older dog will help the younger one learn to be around dogs.