They’ll probably still sell it to you. Be confident and don’t feel like you have to explain your purchase to anyone. Better yet, make it online with curbside pickup so you don’t have to deal with pesky questions from nosy clerks overstepping their authority.
Personally, I’d have some fun with it by launching into a detailed and boring story about each of my 6 horses until they couldn’t wait to get me out of the store ... with my purchase. Bring photos.
I could milk that for sure! Actually we do have horses and there’s a good chance some half used tubes in the barn. What shook me was the claim its not for human use. Altho there’s some irony that the FDA doesn’t approve it for that, but the “vaccines” aren’t approved either.