The product only works when in direct contact with the skin. If you put it between the shoulder blades and it stays on the coat, that's no good. Best bet is to flip the dog over and rub it on the belly. Use a pair of rubber gloves. If the dog isn't real keen to being flipped over and handled like that, put it from the shoulder blades to the tip of the tail, then rub it in a little.
I'd have to go back and do the math, but if memory serves me correctly due to the percentages of Imidacloprid in the Bayer Tree & Shrub (1.47%) vs Bayer Advantage (9.1%) I use about 20cc's of the Tree & Shrub on each dog.
After a bit of research I've come across and tested an inexpensive, high quality means of flea control. It is pretty common knowledge that Frontline is the primo means of controlling fleas. It outperforms Advantage by a significant margin. However, it is too expensive for large yards. Frontline typically costs $20-$30 per dog when purchased from your vet.
After a bit of research I found that the active ingredient, fipronil, is also used in a termite treatment called Termidor SC. This product is available online in 20 ounce bottles for $62.95. Go to
http://www.pestproductsonline.com/products/Termidor_SC_20_oz-14-0.html to purchase.
To use, measure in a syringe and drop it on your dogs belly. Be sure to apply in areas that your dog cannot lick.
I treated more than 100 dogs with 1 bottle. In fact, given the conversion ratio of 28.4131 ml per fluid ounce, you should be able to treat about 10 44-88 lb dogs per ounce of termidor, or 200 dogs per 20 ounce container. At a typical vet cost of $25 per dog, you can save over $4900 with a single container of Termidor!
Dose it as follows:
45-88 lbs 2.7 ml
23-44 lbs 1.4 ml
00-22 lbs .7 ml
You can expect high quality flea control for at least a month using this product in this manner. Feel free to crosspost this wherever it might do some good!