No yogurt, it's an actual probiotic that I'm mixing in some applesauce along with vit c. Dairy always makes me nervous with rats.
I'm trying to keep everything smelly out of there. I think I'm doing okay with it. First I moved their cage out in the hall where there's lots of cross ventilation and where they aren't right by all my other animals. In some of my cages I use the cheap bunny food as litter, in some I use carefresh, but in there's I just have fleece everywhere and a litter pan with carefresh. I don't think they're close enough to anyone else's bedding or anything to hurt them, but who knows, they can be pretty sensitive.
I just read in my rat health guide that you can give adult rats a 1.3 mg dose of pseudoephedrine 3 times a day for congestion, but I'm awfully nervous to do that without calling the vet, so I'm going to try to get a hold of him later today.
Actually though, the congestion did seem better today, maybe we're making progress.
But you're right, I wouldn't be a bit surprised if we go in for their re-check and end up adding another antibiotic like doxy.