Would it be safe and effective to give a 20lb dog a 1/4 dose of Nextgard intended for a dog 60-120 lbs? I’d like an answer based on fact, not opinion. :)
We at Barkibu, nor the veterinarians cooperating with us, are not allowed to give you any treatment, as that is not possible without seeing the animal.
In any case, you should contact with your veterinarian in order to recommend you more specific guideline on how to proceed in this case, since he/she is more familiar with the health history of your dog.
All the best,