Personally, I would be afraid to rely on the odds and not try to prevent heartworms. Here is a map that shows the reported positives from vet clinics: Google Image Result for http://www.k911.biz/images/HeartwormMap.png
__________________ Life is merrier with a Yorkshire Terrier! Jezebel  & Chuy ... RIP: Barkley  Loosie & Sassy  |