Hi Huckleberry, welcome to the forum. Clumpy is good. Runny is bad. Over feeding milk can cause loose bowels as can several other things. Most notably coccidiosis, often referred to as cocci. It is a parasitic protozoan with diarrhea as a main symptom. There are several drugs used by breeders to combat cocci. Goats develop an immunity to cocci over time with the first year being the most critical for treatment. If you have never had goats on your property before you may not have a big problem with it but since it poses such a serious risk to young goats we have always preferred to be safe and treat for it. Most treatments involve some type of sulfa drug to kill the cocci.