Thanks for the info 

 I will call him. He gave us Purina Fortiflora. I'm totally in the dark on this stuff.
These are the ingredients: 
Ingredients Animal digest, Enterococcus faecium, L-ascorbyl- 2-polyphosphate (source of Vitamin C), Vitamin E supplement, beta-Carotene, zinc proteinate, salt, manganese proteinate, ferrous sulfate, copper proteinate, calcium iodate, sodium selenite. A-4582  
Contains a source of live (viable) naturally occurring microorganisms. 
Feeding And Administration Use under the supervision or direction of your veterinarian. A box of FortiFlora™ contains 30 packets. Each packet is 1 gram and is guaranteed to deliver 1 X 108 CFU/g of Enterococcus faecium SF68.