i dont think a shock collar is the answer.. they've only been together for 3 days! You need to be patient and give it time.
Maybe you can associate kitty time with treat time. When you get the 2 together, give your dog lots of treats and praise for good behavior around the kitten. If the dog misbehaves, remove him from the room. Eventually he will realize that being near the kitten means he can also be near his people and he also gets lots of love and treats. You might want to try this kind of approach first.
There are quite a few people on OT that know wayyyyyyyyy more about dogs/training than I.. you might want to ask them. ie, ShannonO, Sharkbait or Coop... they know what they're talking about. Take a look at the dog thread for tips as well.