Probiotic Use, Changing Products--Any Advice?

[WHanson12]

Does anyone have any experience with or an opinion on the following, regarding changing from one probiotic product to another:

 

I am switching from daily Iams Prostora prescription only probiotic (very expensive!) to daily VetriScience, VetriBiotic BD for our senior girl who has inconsistent poop forms, as well as a sensitive tummy (& a picky eater).

Since there was no lapse between the 2 different probiotics, should I administer the VetriBiotic at the maintenance dose or at the initial dose (more tablets per day for 4 weeks, then maintenance level)?

There are more stains of bacteria in the VetriBiotic than the Prostora.

 

Thanks for any suggestions y'all may have!