Sionnach said in rec.pets.dogs.breeds:

I know 6 Standard Poodles - 4 are dog aggressive. I've
seen others write that Standards seem to be more dog
aggressive than Miniatures and Toys. This is just
anecdotal, of course, and my sample size is small.

I don't know if I'd say Standards are *more* aggressive.

I did give a ton of caveats.

--
--Matt. Rocky's a Dog.