I don't know of any dwarf Knock Out roses but Drift roses are said to be very disease resistant could you have those mixed up, the Drift roses are said to be small. My Knock Out roses have been in my yard for three or four years now, but because they are so easy to prune I have been able to keep them small, plus they just don't seem to have wanted to get huge. I know that could change as the plants mature, but so far mine have been just what I wanted them to be.
