> used all at once as it depletes after opening!
That's a thought. I wonder if freezing yogurt in ice cube trays would preserve its probiotic function? If you only have one dog you'd be unlikely to use it all up straight after opening.
I have used Pro-Kolin on occasion, less often since we've been raw feeding. I think it does work. But I'd be reluctant to use it on a long term basis if something more natural like yogurt would do the job just as well. As the OP has had such problems with her dog I would guess she might need to use something more often than most of us.
Hope you get Robbie sorted soon.