turns out its made by the same company as the Biospot. Same product, different brand and marketed differently. I guess I'm not surprised by that.
Instead of marketing it by small, medium and large dog, it's sold only in 1cc vials in a 48 vial box, and you use 1, 2 or 3 vials depending on the size of the dog.
And I'm getting 9-10 months worth of Zodiac for the price of 6 months worth of Biospot. 
Between the 2 dogs, I'm set for this year and next!
Thank you, though. If the ticks start showing resistance to the Zodiac (I also had read rumors of that regarding Biospot, but have seen zero sign of it), I'll switch to the Frontline generic.
Meantime, they're not getting as much free time. I found another coffee-beaner, bringing it to 7. This one had dropped off and was dead. And I've also started finding a lot of little dead ticks everywhere. Yuck. Apparently the new formula doesn't repel the ticks, although it does seem to be killing some of them (maybe half?) before they fill up.
I seem to remember having read somewhere that they have to be active in you for 48 hours before the lyme disease microbe (forget its name) gets through in sufficient amount to give you the disease. But that was for humans, was probably referring to a single tick, and of course your immune system activity is an important factor too.
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