Collies and Shelties and some other breeds are sensitive to the drug Ivermectin, which is in Heartguard. Interceptor is a better choice for heartworm. Hope this helps! Kerry
This is an older thread, you may not receive a response, and could
be reviving an old thread. Please consider creating a new thread.
Beagles Unlimited Forums
A forum community dedicated to Beagle owners and enthusiasts. Come join the discussion about breeding, health, behavior, housing, adopting, care, classifieds, and more!