Hrm, the air spray seems like a bad idea in my experience. First they put an extremely foul bittering agent in them to deter the usage of it as an inhalant. Second they have this nasty tendency to spray straight propellant, which is often butane, a chemical with an extremely low boiling point that cools objects it touches. A slight bit of butane on the skin will cause irritation, a bit more will actually freeze the skin, any more than that and, well, on a small animal you could end up killing it through freezing.

I know these things because the moment I realized I could get butane out of them I started playing with the freezing factor of it (drop some water in for ice, lol, it's actually really entertaining) and this was cool and all until I ran into the ones with the bittering agent, which will make you feel sick. It's horrid.