Just ran across this map showing the incidence of Heartworm. Logically it occurs most where there are the most mosquitoes. Boy it would be nice to live in a place where they didn't carry you off in the summer. Just this morning after I let the boys out I saw Duke looking at me through the kitchen window and there was a big fat one one the side of his face. I ran out and got that one. Now only sixteen bizzilion more to go.