Σκυλιά και ποδηλάτες

http://www.kenkifer.com/bikepages/traffic/dogs.htm
http://www.freepatentsonline.com/7017526.html
http://en.allexperts.com/q/Canine-Behavior-3553/defend-against-dog-attack.htm
http://www.aboutdogs.us/bicyclesanddogs.php
http://selfdefenseproducts.wordpress.com/2008/08/29/defend-yourself-from-attacking-dogs-2/
http://www.tbotech.com/dogrepellent.htm
http://www.crazyguyonabike.com/doc/page/?page_id=4864
http://www.halt.com/halt.html