Heartworms come from the bites of mosquitoes. You have mosquitoes, you run the risk of heartworms. My four are on Revolution combination. Have one that is allergic to Frontline and another to Heartguard.
__________________ Joanne  Eli  Chipper Eva  Snowboy Rosie(R.I.P. 1996-July 29, 2013) Cocoa(R.I.P 1998-April 26, 2012): |