

Complete newbies here: messed up pour-on dewormer application, did it completely miss the skin? Need advice!
Hi everyone,
My girlfriend and I are completely new to raising goats. We recently got a mom and her kid — we believe they are Nigerian Dwarfs (they are our first ones ever, so we are still learning the ropes!).
Yesterday, we noticed some lice and wanted to treat them for both external and internal parasites. We got a pour-on medication from our vet (10cc for the mom, 7cc for the kid). The vet told us to keep them isolated for 5 hours so it could dry, which we did (actually kept them separated from our dogs for about 13 hours just to be safe).
However, since we are total beginners, we might have messed up the application technique. Instead of parting the fur to expose the skin, we just pressed the tip of the syringe against their backs (over the fur) and squirted the medicine along their spine.
Today, the lice are still very much alive and crawling. Also, the fur on the mom's back looks a little bit stiff and "raised" (the kid's fur looks okay).
Realistically, will the treatment still have any effect?
If it fails, how long should we wait before reapplying the dose correctly so we don't risk toxicity/overdosing them?
Any advice for clueless beginners would be highly appreciated. We want to do right by our goats! Thank you!
EDIT: Just to clarify, our vet's main goal right now was definitely to treat the lice, since they were very visible and bothering the goats. He just gave us this specific product because he said it treats both endo and ecto-parasites at the same time. EDIT 2: The product is eprinomectin. His protocol is to apply it twice a year as a routine treatment for both endo and ecto-parasites, without any booster dose a few weeks later.