Can I give two smaller Heartgard Plus doses to my large dog?

Question

I accidentally bought the green pack of heatgard plus for dogs 26-50 lbs but I needed the brown pack for dogs over 50 lbs. Am I able to give 2 doses to my dog? The green pack contains 136 mcg ivermectin and 114 mg pyrantel. The brown pack contains 272 mcg icermectin and 227 mg of pyrantel so it seems that giving 2 would be correct but I'm still nervous to do so. Pet's info: Dog | Mixed Breed Large (61lb +) | Female | spayed | 1 year and 9 months old | 65 lbs

Dr. Melanie, BVSc MS · Accepted Answer

Yes, you can give Fern two doses of the Heartgard so that she will get the correct amount of medication. Heartgard is a pretty safe drug, and you would need 10 to 20 times the recommended dose to see toxicity; however, in this case, because two of the chews from the green pack equals the same amount of medication in one chew from the brown pack, it's safe to give to her. I hope this helps!

Can I give two smaller Heartgard Plus doses to my large dog?

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