I've sprayed numerous dogs, especially when their idiot owners didn't control them properly. I've also been known to spray the idiot owners too when they complained. Very satisfying.
I've sprayed cheeky kids, interfering old busy bodies who wanted to know what I was doing and wouldn't accept "window cleaning" as an answer.
I sprayed a tortoise once who I kept nearly standing on (to get him to move out the way) but he rather liked it and stayed put.
I've also sprayed the missus a few times to get her to stop moaning about something. I give her three warnings then spray. Works wonders, but she often retaliates.
Basically I spray anything that moves and a lot of things that don't. A wfp is a wonderful weapon, and I'm just trigger happy.