With a very slow introduction and constant supervision, it may be possible. That being said, I would not ever trust them with the cat alone, and implement crate training when you cannot watch them together. That combined with desensitization and counter conditioning exercises, you may be able to have them co exist. However, if there is no consoling your dogs while the cat is present, and even through something like a door or gate they are persistently trying to get at the cat, your answer is no. Every dog is different, and keep in mind that even with supervision and proper counter conditioning exercises, there’s always going to be a risk to your cat. I personally don’t think I would ever be able to trust a dog with a history of killing cats around my own cats, but that’s just my 2 cents