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Hello, I'm Dr. Deb. Thanks for requesting me; I'll do my best to help you today.
I'm sorry for this concern for your Beagle. As you might expect this is a question that often gets asked for those dogs who are close to the cut off weight for oral and topical medication such as Nexgard.
As far as flea and tick products go, Nexgard is one of the safer ones, I'm happy to say. And, there's often a dosage range for many drugs (not just this one) which is why there's such a wide weight range.
You could certainly cut the pill in half (the active ingredients are equally distributed in the pill) but I'm not sure that he would be adequately protected if you do.
If this were my dog, I'd give the entire pill but you could give him 1/2 if you wanted. I hope this helps. Deb