During a robbery, a K9 Officer kills the son from a well known crime family. In revenge for killing his only son the father orders the execution of the Officer's entire family. Devastated, the Officer unleashes his arsenal of police dogs to wage a vicious war against the father and his crime syndicate.

The problem with your logline is you have more than one inciting incident.

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“After his family is brutally murdered by a drug kingpin, a loving K-9 officer uses his armada of police dogs to wage war on the viscous cartel.”
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Hope that helped, good luck with this!

Thanks, hoped I helped,

btw one of the rules of loglines is, don’t use the characters name unless they are famous. If you haven’t sent it off yet I would reconsider.