Don't know if this will help but I saw thisOriginally Posted by lv4dogs
http://www.heartwormsociety.org/incidencemapnew.htm
Heartworm wasn't big in CA for years, so most people did't test or have their dogs on prevention. It's unfortunately becoming much more common, so we're now having to include that in normal checkups like a lot of other states, but to be honest most don't even think about it hear.
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