Interceptor can be given at 1/5 the recommended dose. At that dose, it's effective against HW, but not for the other intestinal worms. I might try that. I used to give my 80 lb GSD the 11- 25 lb size (green box). There is an FDA data sheet on this, it's called the Safeheart dose. After I showed that to my vet, she had no problem prescribing the lower dosage.
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