Welcome to the cat side!

I have three cats and a dog and was lucky when I got Jazz last year and Scout this year because my dog was already use to Ripley. Have these cats been around dogs at all? If so then it shouldn't be too difficult to introduce them. If not, I'm not sure what to tell you. Everything I've read says to keep them seperate while they get use to each other's smell, just like you are doing and then introduce them slowly. It's usually best to keep you dogs leashed so you have control in case they decided to lunge at or chase the cats.

I'm sure more experienced people here will have more advice to offer. I look forward to seeing pics of your new furbabies. I'm not sure I know what Serengettis look like but I bet they are beautifully exotic.