I am not sure what you have access to in Australia, but yes, Tylan-tylosin tartrate used for farm animals. My vet first prescribed it for the dogs and then I just ordered a larger size bottle from a supply company. In farm animals, its OTC. I use the powder.
We did the metronidazole route with our two dogs first, and it worked, but metron should not be a long term medication-Tylan powder CAN be used longer term. We used it with every meal for 30 days, then I weaned them off of it. It worked liked a charm, but did take a lot of trial and error in getting the correct diets. First, I can tell you that YES YES YES YES to the lower fiber.
Secondly, they do NOT do well with diet changes. We feed the two with issues Victor Ultra pro, Abady granular, and raw. While we on occasion have a flare up, its been quite a while for any major issues. When one does flare up, its typically because they got something they should not have-either bunny poo or a treat, or kibble that the others eat. When this happens, we will use the tylan for a 3-4 day period and then all is well. For the record, one has not needed Tylan in several years, and the other(Maya) has a flare up perhaps two-three times a year now versus every few months.
I also found that white rice(as in doing aa boiled rice/chicken diet) to stop the runs is a big NO NO.
