I've got Din-O-Vite. I got it for my precious Jade shortly she got sick with cancer. I put it in with her food - not the amount recommended, just half of their spoon amount, usually once a day. I had vet check it out first and was told it has many good probiotics so certainly wouldn't harm her 'cause probiotics are veery good.
Does is work? Who knows? I can tell you, I elected not to use Tuft's Univ. protocol when Jade got sick, but went there initially. When they checked her out they told me her blood and organs were like those of a much younger dog. I had a vet who does acupuncture coming to house, along with meds and people food. She was a Tufts graduate and at a seminar had been talking with the head of oncology who was shocked to learn my Jade was still alive. They finally convinced me to bring Jade back and again, the blood/organ results were representative of those of a much younger dog.
When I got my Eddy, he had previously been paralyzed 'cause someone had broken his spine. The rescue pulled him from his second foster and Eddy was in the hospital again for two weeks before coming to me - still on a lot of meds (evry twelve hours). My vet checked him out last years when I brought him in for required shots. He said it was amazing what the surgeons had done. Eddy was still having great difficulty walking. Took Eddy in eight days ago. Was expecting to get the weight lecture as Eddy had gained six pounds. To my utter surprise the doctor asked me what I was doing.
I sneak it in the food - polish loaf, a fave, or wet food, or 'people' food. The taste stuff they send in the package really don't help. I only give apx half a tsp. so th stuff lasts forever. I also on occasion will sprinkle some Extend over the food - just to change things out. But, I don't give any where near the recommended dosages. All I can tell you, imho, it doesn't hurt!