Right now because your girl is going through her critical growth period as a large breed puppy adding a food like Regional Red with far too much calcium/phosphorus could possibly lead to skeletal and growth disorders. The FirstMate formula you have as 80% of her meal is formulated correctly for a LBP. Could you perhaps try eliminating the Regional Red and seeing how she does? The problem with mixing these two foods or mixing any two foods right now is that you might be feeding an unsafe amount of calcium. You can add the probiotic powder to her FirstMate to help with the loose stools.
