Movd this to SiteAdvisor as the main place for this kind of thing.
Security Scan Plus is merely a sales tool that is an optional download with such things as Adobe Reader or Flash etc. Uninstall it in the normal manner as it will be listed in your Program list. It provides only superficial security information.
That said, SiteAdvisor has a yellow alert for that website and the page where a site owner can appeal is here: https://www.siteadvisor.com/sites/http://www.dogsunit.com/?pip=true&premium=true &client_uid=3885869200&client_ver=188.8.131.52&client_type=IEPlugin&suite=true&aff_ id=0&locale=en_ca&ui=1&os_ver=184.108.40.206
Or alterntaively you could approach it through Trusted Source. See this contact information: https://community.mcafee.com/message/66185#66185