Figured I'd ask before trying: Does being Beatrix's pet block you out of finishing No Sacred Cows for Kira? I know that trying to work there becomes impossible because she'll order you away for your own safety (and to keep your blood tasty), but since No Sacred Cows requires you to be around the farm for awhile, does she interrupt things at any point? It never came up in the walkthrough.
Also, at what point do the Zantis cowify Keiko?