In Corepaul wrote:
How can I keep the neighbor's cats from using my raised rose beds as a
litter box?

There is a cat and dog repellent gel and granules he

http://www.multicrop.com.au/animal.htm

Other than that, your choices may include

(a) A dog
(b) An air rifle loaded with those silver cake decoration balls
(c) A hose
(d) A motion-detecting sprinkler - http://www8.smarthome.com/6120.html

Good luck!