I have hit the vein by accident (more than once) and it may be a little messier than hitting the sweet spot and Casey is fine (I do apply the neosporin + pain to her ear before each test). The first time it seemed to bother her, but I think she was reacting to my reaction more than anything because, beside her wanting to flick the moisture of her ear, she was content.
When this does happen, I first tell myself to stay calm (she feeds off my emotion)! I then proceed to get the reading, then take the cotton and hold the spot to stop the bleeding, give her praise & treats, and then moisten a clean cotton pad w/rubbing alcohol & wipe the area to make sure it is clean (of course followed by more praise & treats). Once that is all done, I find and clean-up any little droplets that may have scattered from her flick of the ear.
Hope this helps,
Roberta
and Casey