Hmmmm, good question!
Deer are probably too large, but I know it works on skunks, possums and raccoons. Getting VERY tempted to try in on the squirrels if they don't stop being such enormous pains.
Kinda a sad way to go for the little critters, but hey! They should keep their mitts OUT of my stuff!
:)
http://www.pestcontrol-products.com/urines_all.htm
I'd hate to be the guy that has to collect the Mountain Lion pee...