I don’t worry about it, but I do rotate probiotics as well as everything else. Dogs also get some probiotics from eating stuff off the ground as well. If you are having a problem, I might worry more about making sure about what specific probiotics are in there, but generally speaking, if you keep the gut a healthy place for a variety of probiotics then life will put them there and they will multiply on their own. Since they do compete with bad bugs, adding more regularly is for the immune boost, and adding the greatest variety possible is best, but their is no way to make sure you get them all. They haven’t even necessarily identified them all yet.
