<seems my newsgroup reader is on the frits. I needed to use Google to
reply>

This was part of my question but it would seem that it's the same
chemical. The chemical affects the fleas, not the animal. It's topical
so I don't see any reason for changing the chemical used based on the
type of animal. Also, it seems that the amount of the chemical used
increases as the size of the animal being treated increases. This would
also indicate that it's the same concentrate of chemical, just more of
it to cover a larger animal.

We all know how expensive Advantage and Frontline are. If it's true
that we can buy twice as much of it for only a few dollars more, I'm
all for it!

The ingredients and strength in Advantage ( not Advantix) are
identical for cats and dogs, active ingredient 10% Imidacloprid;
1-[(6-Chloro-3-pyridinyl) methyl]-N-nitro-2-imidazolidinimine, but
one can check that from the labels on the boxes.  I have been
splitting Advantage for multiple cats for a number of years. I buy it
from my vet with his full knowledge and approval.

I apply the minimum effective dosage which is about .05 ml per pound
of body weight, so 4 ml will treat 8, 10 pound cats.

http://www.lisaviolet.com/cathouse/advantage.html

From Bayer's web site.

Dosage 10 mg/ kg body weight topical solution (0.4 ml of the 10 %
solution to cats under 9lbs body weight, 0.8 ml of the 10 % solution
to cats over 9lbs of body weight, 0.4 ml of the 10 % solution to dogs
10lbs and under, 1,0 ml of the 10 % solution to dogs between 11 -
20lbs of body weight, 2,5ml of the 10 % solution to dogs 21-55lbs of
body weight, 4,0ml of the 10 % solution to dogs over 55lbs of body
weight).  

http://www.animalhealth.bayerhealthcare.com/491.0.html?tx_bahprdmx_pi1%5Btx_bahp
rdmx_prods.trademark%5D=ADVANTAGE&no_cache=1

BarB

PS You can split Revolution also, but the strength is double in the
dog sizes.