I have a soft coated wheaten terrier and he is extremely reactive, when in training I was told it is a eye contact issue with dogs (they stare him in the eyes and this starts the problem) but this isn't his only problem, he reacts to barks from outside, gets hyper when he sees children because he wants to "play" (akin to tackling if I'm not careful), previously barked and stared at a hamster he presumably wanted to eat, and does react as expected when he sees a cat running away outside (he wants to chase).
Thus I know he has a strong prey drive, and I know he desperately needs to be socialized, and i do intend to socialize him (when get him back, he's currently with my parents)
So, as of right now i have foster dogs and I absolutely love fostering but I'm not entirely comfortable having a foster dog with him because he can turn on a dime with a dog. An example being that he likes my parents dog but because she barks at him when he is riled up he has bitten her (once.. not bad enough for vet but did see some blood) to get her to back off (it never seems like his intent was harm but because she was in his face while he was anxious he bit her).
Thus I'm wondering if i could foster a cat instead of a dog. I think this would help socialize him and be a great benefit to both of our lives. I have my kitchen sectioned off with a cat friendly gate (opens and closes for people and has a cat "door" too small for him) and was theorizing having cat food, and litter box in there along with maybe a bed or something so that in the beginning the cat would stay in that room until we were all comfortable opening the cat door to let it interact with him, and then he would be on a leash and the cat would be able to run back to "safety" if it felt threatened. Honestly, I have no idea if he will even care about a cat, but the worst that he would do is chase it and bark a lot at it but once calm I think he could learn to be "nice". I just want opinions from cat and dog owners on if this is insane, or unfair to a cat. (not looking to do this for approximately 4 months)