i suppose best way to get to know your vet is to use them regulary , see what new treatments there are as same treatment is bad as they get used to it , many times i have treated took bird in said i have treated for canker ectra and stuffs not worked so since then im more for prevention rather than the cure , after moultings over get droppings tested get a micro bacteria swab and wait then treat before pairing up if nessasary then test again about 2 months before racing then dropings every month before i give canker treatment for a few days