I don't know what to suggest.

I know when I first brought my cat home, I thought my lab would kill her for sure if I left them alone. I slowly introduced them. At first I put a muzzle on Josie to see how she would react to my cat. I had a gate keeping them seperate too. They could see each other and smell, but nothing else. It took almost a month, but now they get along good and I don't have to worry about them. I also recently got another kitty. It only took Josie 10 minutes this time before I knew she was going to be fine with him!

Good luck, he is a cutie!