OUCH! Citrus in my eye! 
Sorry I couldn't help that...Apparently it's
not supposed to sting...I think if you are going to do it to your pet (anything besides good old fashioned effort in training without aggression) you need to
try it on yourself and of course research everything
first.
Isn't there something online listing warnings about these spray collars and nasal issues...
hmmm if I was going to get and use one I'd look that up prior then make my decision...
1. I'd be careful to only use any collar under supervision...
2. this video is for a shock collar..."specifically made for small dogs...up to 55 lbs"
3. Spray vs shock...