Remember you are the customer and always have the choice of refusing.
It is our responsibility as pet parents to do what we think is right for our pets. There are so many cases of problems with Ivermectin that have been documented, why would you even consider a second dose?
My newest girl AnRa born 12-10-19, came home 2-13-20
RIP dearest Rana 4-19-15 --12-12-19, I will miss you forever
RIP my dear Nara 7/2/10---1/6/15. Mommy will always love you.