Does it hurt

Not at all. It is intensely cold*, to some that might come as a shock but I find that both horse and human settle very quickly once they realise it is not painful. It is loud, the carbon dioxide looks smokey, I have found that sensitive horses really benefit with a mild sedation the first two treatments, after that every single one of my horses enjoy the treatment. 

* it comes out at -175’C at 50 bars of pressure, so its really cold and feels like quite a bit of pressure. Pressure can be controlled by administrator depending on distance. It is pain-free, but very cold.