So does the Bayer Tree and Shrub no longer have the correct active ingredient, I can't find it on Bayers site, the active ingredient list. I see other websites talking about it but they are older posts.
You guys are all awesome by the way. Would have never known that I don't need to spend $70 for a 3 month supply of Advantix.
Found answer after better googling. Guess I'll be going to home depot at lunch.
I finally found one label on Bayer site. Looks like one of them (the 12 month one) had a higher (almost 3%) dosage but it's still the Imidacloprid.

Bayer Advantage II For Dogs has same ingredients as stated by other posters:
Imidacloprid; 1-[6-Chloro-3-pyrindinyl) methyl]-N-nitro-2-imidazolidinimine 9.1%
Pyriproxyfen IGR (Insect Growth Regulator) 0.46%
Other ingredients 90.44%
Any people good at math that can calculate CC's per lb at different dosage strengths. By brain is not working.