A company that sells probiotics for dogs mentions they should only be used for 60 days and then switched. So if you are eating say activa yogurt daily, does it lose effectiveness?
If it matters, this is from the dog product info page
Active Ingredients (per capsule):
Saccharomyces boulardii 2.5 billion CFU Bio-MOS® (Mannan Oligosaccharides) 70 mg PreforPro®: LH01-Myoviridae, 3 mg LL5-Siphoviridae, T4D-Myoviridae, LL12-Myoviridae
Answer
Only offering information from my vet for possibly your research purposes. Dogs digestive systems are more resilient to jardia (sp?) and other such bad bacteria from drinking from streams because their digestive system is much shorter than ours. Theirs is, iirc, twice as fast.
I have no idea how that applies to your question but I thought I would throw it out there.