I few years back I asked my vet about using injectable Ivemectin for cattle for my dogs HW prevention (given orally). He said to use a .1 cc/10# body weight per 6 months. I use a small syringe to draw the dose then another syringe (w/o needle) to squirt it in the dogs mouths. I have never had any problems and definitely saved money on the 4 dogs at the time. My new GS pup is arriving soon. When he is ready to start on HW prevention is the ivemectin approach still the way to go? I have read that many folks give it monthly. Any advice would be appreciated.