Sounds like you've made a good life for yourself over there mate fareplay to you miles and miles of land to course on sounds like a dream come tru all the best to you
I always use frontline keeps everything off them duramitex is good stuff never had to use it tho but what ever you get use it quick horrible things ticks good luck.
In the winter i give my dogs a small meal of pro plan in the mornin then raw meat rice bread n veg at night when the season finishes i put em on dr johns.