I have always used the valbazen (500cc) and mix 10-15cc of ivomec into it. Shake it up before you use it and so far my dogs have also been free and clear. I use this on my puppies starting out around 3-4 wks old also. I do not rotate wormers either. Been using this for 5 yrs. I have asked 3 of our local vets and all have said that is a good worming recipe...Others on here also have good worming recipes but this is what has been working for me.
Randy
What dosage do you use?