I'm a committed reward trainer, so I wouldn't do it even it I could, but until the fear response develops, I don't actually think it would be possible (which is about 8-9 wks usually). After that they'd be in a fear imprint stage, and the fallout from being corrected (by a human or the environment) could be profound.
In the case of breeds that tend to be predatory towards cats, you'd have a good chance of them recognising cats as individuals that are of social interest, rather than prey, simply by socialising them to cats from early on and continuing it as they grow.