About 14 years ago I brought home two kittens and had to introduce them to my Australian Shephard. It was a frightful event. It took two of us to control the animals. One went in and leashed the dog. Then the other brought the kittens-in-a-box into the house and to a back bedroom and closed the door.
Next calmed the dog down.
Then brought the dog - still on a leash - to the kittens. The dog behaved but the kittens hissed and spat. (It was scary but kind of funny, too!) I knew if the kittens kept at it, the dog would retaliate and then there would be no more kittens in my house.
Soo... I kept them apart that first night. Kittens locked in a bedroom with a 10-year-old. (The kittens were for him and he was delighted!) The dog stayed in my room with me.
During the day I left the kittens in the bedroom with food, water and litter box. At night I brought the dog into my room, closed the door and let the kittens roam around the house to they could get used to the scent of the dog and, of course, leave a little of their scent (NO SPRAYING) throughout.
Then I started with just a few minutes intermingling in the evening. By the end of a week or so they had free reign while we got ready for school and work and for a few hours in the evening. I still separated them when noone was home and during the night, too. I kept the dog whereever I was at home so she wouldn't get jealous and anxious.
As I recall, it took about 2 weeks until I felt comfortable letting the all stay together when I wasn't home.
There are some funny, funny stories from those first few weeks. I smile when I remember them...
Good luck with this little project.
-Aude.