Interesting. A lot of those articles are from people who sell probiotics or are raving about the Purina product- and never was there a more evil and less trustworthy company than nestle. But the whole dog journal article and the vet one were interesting. I still must be missing something here though, cause all of the strains listed in those articles are also found in human products except that one you mentioned. And human products that are suspended in any sort of fruit juice are all stabilized.
Huh? I saw one single mention of Purina and that was the name of their probiotics in the first link, I certainly read no "raving" about it?
The first link is from a Veterinary Surgeon who speaks of the benefits of probiotics generally, and he puts forward 4 x "popular brands" for people to consider & research - how's he trying to sell anything? I see no link to order product from him, maybe I missed it?
Whilst the 2nd link does indeed relate to an actual purveyor of probiotics, specifically the brand Nusentia, it is nonetheless, jam packed with links to various published scientific studies, articles etc. I presumed that's the part of the article you would read, not the sales & marketing bump.
The 3rd link is not relating to probiotics per se, rather, it's about PRE
biotics, meaning it's a product taken prior to the probiotics to increase their efficacy - I just threw that in there out of interests sake. I've seen many prebiotics available for sale from all sorts of manufacturers, mainly the naturopathic, tree-hugging, greenie type, and a lot of people swearing they're the best thing since sliced bread.
The final link is, of course, the very complex one done by a Veterinary University in Canada, if memory serves me correctly, so no-one hawking their goods.
Basically the science fraternity all agree unanimously that probiotics advertised in processed dog food is pure, utter BS - either they're dead, simply not there at all upon analysis (scurrilous lies & false advertising) or, if they are there, in such minute numbers, chances of survival is absolutely minimal.
Hence, to my mind, feeding a high grade brand from a coy. that's spend $1m's on research & development, that has all the right strains (especially the aforementioned one &, most importantly, the "Lacto animalis" or whatever it's called one, can only be beneficial.
Clearly, the proof is going to be in the pudding isn't it - visible by the dog's general health, stamina, fresher breath, better coat, consistent perfect poops, and heaven only knows what else will manifest as a result of having their gut re-packed with new or more of a strain/s.
I do know from my many & succesful tropical fish tanks that I have running is that bacteria will only grow and then die off according to the bioload in needs to deal with i.e. remove half the fish & half the bacteria will die.
Conversely, add an extra 50% of fish in one hit, and you're likely to suffer a massive ammonia spike until the bacteria can proliferate to the level it needs to be to process the bioload being crapped out by the extra critters.
Dose the tank with antibiotics and you'll kill ALL bacteria and have to start the "cycling process", as we call it, right from scratch again.
Sounds familiar? A bit like a dog's guts - it's absolutely identical in fact, that's what bacteria do in animals, out of animals, that's their purpose in life, to completely BALANCE their environment so it's completely harmonious - stuff goes in, gets pooped out, bacteria sorts it, well & truly. The more environment specific good strains the better, regardless of whose guts, filters, cheese factories etc. you're dealing with.