This plugin allows you to remove the prefix before the URL to your category page (e.g. example.com/dogs instead of example.com/category/dogs)
The Top Level Categories plugin allows you to remove the prefix before the URL to your category page. For example, instead of http://fortes.com/category/work, I use http://fortes.com/work for the address my "work" category. WordPress doesn't allow you to have a blank prefix for categories (they insert
category/ before the name), this plugin works around that restriction.