Quote Originally Posted by caseysmom
From this it looks like you may not have heartworms in your area:

http://www.avma.ab.ca/animal_health/...th8.htm#point5

Ticks and Lyme disease are bigger concern in Saskatchewan than heartworms. I grew up there and we always treated our dogs for ticks and heartworm, despite the lower risk. I also did heartworm protection when I lived in Alberta. We don't do it anymore. My vet doesn't even carry the meds as he's never seen a case up here.