We recently purchased land and our dogs will be trekking through it. It has tons of deer so I need to add treatment for tics now that they will be exposed. They are on advantage multi but I'm going to have to put them on Advantix or Revolution for the tics if I can't find something holistic that works. Does anything work on ALL parasites including heartworm protection? I'd prefer going the natural route if I can. I have read that neem works well and have organic neem bark but not sure if it actually works and don't know if I trust their lives to using it alone.