A cat deterrent is a mechanism or device used to discourage
entering an area, or to encourage them to leave if they do enter. Cat
deterrents are most commonly used by
in order to prevent damage to their gardens or avoid acquiring unwanted
cat faeces; people with an interest in observing garden birds also
use cat deterrents.
Cat deterrents include:
orange peel and other objects of a
Lion Dung has been reported to be an effective method of deterring cats, and
has received support from the British organisation
Cats Protection. Research reported by the BBC
 found that it was not terribly effective however.
Cats dislike the smell of citrus, and citrus-based products are used by some
as a deterrent.
Ultrasonic devices (inaudible to humans) are a popular method of deterring
cats. The RSPB, on
the basis of a trial involving 150 volunteers, has endorsed a commerical product
RSPB research on electronic cat deterrents
A design for an electric fence for deterring cats can be found
here. A variety of commerically produced electric fences are also available,
with voltages low enough to deter but not cause harm to cats. Care must be taken
with the strength of electric current used; one Cumbria
pensioner received a fine for setting up a system based on a 12v battery
Cats Protection describe the use of electric fences as "barbaric" on their
website, though they do not give any evidence to support this view.