[AdonisRotts]

Well best of luck with your cat situation. My two love kitties and my cat is very dog friendly. They share toys, clean each other, and hang out together. But we have had our share of not dog friendly cat situations. We live on a farm and seem to get alot of stray cats show up (must be the barns). A couple of days ago a stray kitten showed up and Naya attempted her usual "hi, how are you kitty?" She laid down in front of the kitten and attempted to clean it. (Mind you that Naya was out playing in one of the pastures and we were watching from a distance) It tolerated her for a moment, then hissed and attempted to scratch Naya. I called Naya to us and started over to remove the kitten. I heard that kitten making the most horrible growling sounds and hissing, and it wanted to run off. Naya stood just a few feet away, and did an incredible bark and hold. She was so loud and everytime the cat started to move she circled around and kept it still. It was hilarious!!!! I thought I was going to die laughing, it was like she was telling the cat, "Don't you dare move, my mom's coming, and she will get rid of you!" She had no intentions of hurting that cat, but she wasn't going to allow it to run around on the farm acting like that. I picked up the kitten, who hissed at me and put her in a crate to take to the animal shelter. I watched Naya keep going to the crate, tale wiggling, saying, "Please won't you play with me" I thought I had to share that.
But back to the question at hand, I have seen some cats who just won't live with dogs. Plus cats without claws learn to bite, and my hubby says he has seen horrible cat bites on dogs, their teeth can be incredibly sharp, and make bad puncture wounds which can get badly infected. I would definitely reprimand my cat for starting an unprovoked attack on my dogs. When your rottie gets older, he may not tolerate the situation as well, and you could end up with a doggie/kittie fight.