Is Heartgard brown (51-100 lbs) safe for my dog now under 50 lbs?

She can get the 26-50 lb dose. Heartgard has a wide margin of safety so the larger dose is recommended. It it a better option than potentially underdosing Pudding. You should discuss further concerns with your veterinarian.

Heartgard plus comes in different sizes. Since the next size up is 26 to 50lbs, and she was weighed with leash and collar she can take the 1-25lbs dose. However keep weighing her before giving the dose, as she may gain weight and once she hits 26lbs+ she will need the next higher dose.

While this is not good, it is unlikely that your dog will suffer any ill consequences, especially if she has been treated with Heartguard before and did not have a reaction. Ivermectin has a relatively large safety margin.

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!

Yes! These medications are based on weight and this is usually the manufacturer’s recommendation. If your dog is a little overweight this might be an incentive to get him under 100 lbs. Heartworm is a serious disease and the cost of treatment would by far exceed the cost of the extra pills.

You should give him the appropriate size. If you don’t give him the appropriate size you don’t get the full course of action. You may talk to your veterinarian and see if they can exchange the product for you. All clinics that have different policies. Please feel free to post any additional questions.

Hi there. 68 mcg is the normal dose of Heartgard for a puppy up to 25 pounds, so Beau should be just fine :) Even if he is MDR1 positive (the gene that makes some dogs more sensitive to ivermectin), normal Heartgard doses are still completely safe for these dogs. They can have difficulty with higher ivermectin doses that are sometimes used to treat certain types of mange and other problems, so we do have to be careful with this type of treatment in herding breeds - but regular Heartgard is such a low dose that it's still perfectly safe.