The tinctures used in Rescue Remedy have minute concentrations of the flower essences.
Also - note that the Remedy is not meant to make the dog pass out - its not a sedative, what it does is relax the mind and body in a different way then a tranquelizer works, as you use it with your dog, you will see his or her individual reaction. Also, if you are curious, try it yourself. 10 drops in a cup of chamomile tea. Then you'll better understand the affect it has.