SRUV recently initiated a series of posts on Dangerous Dog Laws (DDL) with this post. The comments to the post are worthy of note, and are posted below for those who may have missed them.
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The fact that DDLs don't address egregious kinds of attacks like the one described here - launching out of a car to disembowel - clearly shows they can address normal dogs, but not gripping/fighting dogs.
Related post: Repeat Offender