[Bobby dog]

Hi Kathleen C:
I prefer kefir over plain yogurt; as pugmomsandy wrote it has more strains of probiotics and has a longer shelf life. Here’s some info on kefir:

http://ottawavalleydogwhisperer.blogspot.com/2013/07/dairy-products-cheese-kefir-yogurt-are.html
http://ottawavalleydogwhisperer.blogspot.com/2012/05/foods-rich-in-probiotics-beneficial-for.html