it really doesn't take much, my friends medium sized dog (isnt small, isnt huge, lol)

Its a spaniel, anyway - about 2-3 blows in the face is enough to definately be able to actually see that the dog is clearly high,, and yes - have a bowl of water and plenty of food and treats available for the dog because they DEFINATELY get the munchies.

Just go real slow with it, you don't want it too fucked, just one or 2 exhalations in the face should be fine.

Jonny