I would not. Actualy I prefer to not use Revolution on any of my animals because I'm fussy about how much toxin I add to their systems.
If you think you can save money doing this I would discuss this with your veterinarian about how to buy a large dose of Revolution and split it.
You can also read here about this product and the dose amounts for each species by body weight
http://www.petplace.com/drug-library/selamectin-revolution/page1.aspx
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