Is this implying that ivermectin is bad for a tiny? I need to start Molly on a heartworm preventative and I think our vet uses Heart Guard (Ivermectin based). Is Interceptor safer? Tucker uses Iverhart Max (Ivermectin based), but he weighs 5.5-6 lbs. Molly is a tiny 2.5lbs.
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Originally Posted by Judy in Waco 
The puppy contract for Gizmo has this clause in it. "If a heartworm preventative containing Ivermectin (Heart Guard) is given to a puppy weighing less then 4 lbs, all health guarantees are void. The recommended preventative for all size yorkies is Interceptor (Ciba-Goigy)."
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