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I also heard it can come from mosquitos...
In the US most people give their dogs "HeartGard" once a month to prevent heartworms...
http://heartgard.us.merial.com/home/
But it sounds like Bobs dog was on a heartworm preventative anyway so it doesn't seem to have helped in his case?
In the US most people give their dogs "HeartGard" once a month to prevent heartworms...
http://heartgard.us.merial.com/home/
But it sounds like Bobs dog was on a heartworm preventative anyway so it doesn't seem to have helped in his case?