This morning I checked on my pups, as always.. and saw that one of them had a messy bottom Even though he is not the runt of the litter he is def. one of the much smaller ones.. but the difference just started developing only the last several days. They are now 3 weeks old.
This morning I gave them all some oat meal since I have heard that is supposed to help and also gave that baby some Bene Bac and will repeat to do this tonight.

I was wondering if anyone has some additional advice on what else I could do? I am really worried that the rest might catch it, too...