I used to have zero survival from scours in baby goats until I found spectogard. I use doses about twice as large as recommended on the bottle because it is quickly passed out the gut and is not absorbed by the body to any extent. I separate the doses by about 36 hours. Usually two doses is enough. As soon as the diarhhea shows first signs of slowing down then stop the medicine. Loose-looking infrequent stool will continue somewhat for 3 more days because it takes a full 3 days for the lining of the gut to heal after all the bad bacteria have been killed off.
I actually use this on my calves and it works great. I usually mix it with some Kao Pectin if I catch it early and they do really well. If it's a little worse case then I mix it with electrolyte and it works wonders. It's the best stuff out there.