Hi,
Advocate/Advantage Multi for dogs 20.1-55 lbs red package is the same formula and dosage made by the same company, Bayer.
http://goo.gl/64aPcG
The Advocate is generally marketed to the UK and Australia while Advantage Multi is marketed to the US and Canada.
You can find more detail about Advantage Multi/Advocate at the following link:
http://www.animalhealth.bayer.com/4882.0.html
Thanks for the inquiry!
By Nabriverhouse on 19 Jul 2013