Probiocin goes by body weight, 1g/up to 10 lbs of body weight and it comes in a metered syringe, which is why I prefer it. My guys get 1g (the newborn dose) once a week unless there are problems or are on ABs. I don't know about Bene-Bac but the directions are on the container. Just don't give it too often. You might want to start out with once a week and see if there is any improvement. If not, then try twice a week but probably not more than that. A vet check on the stool is still a good idea. I think one of our members lost a piggie to worms. Better safe than sorry.