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Dashes in the URL can make it more effective for SEO especially if "abcd" and "efg" are words you wish the search engine to index.
Both "pitbull" and "dog" would be indexed in google, possibly returning better search results for a user searching for "pitbull dog" .
For additional information you can also have a look at the following site: http://www.mattcutts.com/blog/dashes-...