Birds may habituate to pyrotechnics and they are not effective against all species. In dry weather there is a degree of fire hazard associated with these devices. Though they require attention in upkeep and care, setup labor is nonexistent. All that is necessary is to load the dog into the truck for travel out to the site. Gas cannons can be a hazard when they are used during flying hours because their random firing may cause birds to fly into the path of an aircraft.
Cannons are also generally only effective in dispersing waterfowl.
They must be recharged regularly. Since Border Collies are under the direct control of a handler, they disperse wildlife only in prescribed areas and at the direction of the handler. They can be called off at the approach of an aircraft, avoiding potentially dangerous dispersals. Border Collies are also effective against most forms of birds and larger wildlife, not simply waterfowl. Method - Wailers, Noise Generators Airside workers and the general public may consider the noises that these products make an annoyance.