Now I personally don't know much about the ferox, but I can tell you the dododex tags about this seem to be referring to a recently patched glitch where you used to be able to tame a ferox by knocking it out and putting berries in it, hence the "Knockout taming", "Early game" tags. I could be wrong, but it looks like that's what it's referring to. Just FYI.

More Ferox Taming & KO Tips