Lacto B is brilliant and certainly worth a try, dont expect a result over night but give it a few days to start working,,,,,,,,,,,,,they can take it as long as you want cos will not do any harm as ots just a probiotic.
Franta was on it for about 6 months cos every time I stopped it he went backwards,,,,,,,,in his case it was strong abs that had been the cause.
Its a fine white powder and smelless and tasteless and can just be mixed with their wet food.