you can get a probiotic that people use it doesnt have to be a pet probiotic. its recommended to get one that does not require refridgeration. i think culturelle and align are two. i would use one with like 2 billion live cultures. i use natures bounty for sarah as i get it at the drug store here and well she is allergic to everything. ive heard that you get more from the pills than yogurt. i use acv in sarahs water. i use 2 capfuls as if i use more she wont drink it but you can play around with what your pets will drink. if your doing good on nvi lamb then id keep using it. its a good food. it does have peas though so i guess thats not a problem then.