My favorite pro-bio was Wysong. It came in a little bottle w/ a pump. It is very expensive though.
In a pinch I use Nutri-vet food transition packets. You can get it at PetCo. Also works well.
My all time favorite now is raw, unpasteurized goat milk. Only takes 20 min to digest and they absolutely love it. Can’t get enough. (I personally think it’s the nastiest stuff, but it’s not about me.)
I also give them pure pumpkin & bananas. They love that too. Bananas are a very good prebiotic.
If you’re insistent on vegan I guess the raw goat milk won’t be OK for you though.
