[johnthedebs]

I changed the video link to an updated version where he goes into much more detail. You don't need any lure (I didn't use any), but you can see in the updated link that he places the fans around where his dog sleeps and also uses a bottle of soda with the cap slightly unscrewed to slowly leak CO2.

In general though, if there are enough mosquitos around they will get caught in it without any additional effort.