Don't get down on yourself, okay? Gosh, we've *all*, every single one of us, made mistakes w/ our kiddos! It happens to all of us...we're only mere humans, caring for these little gods, I mean dogs
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I would check the area thoroughly to make sure you got it all. I'd probably also call your vet and ask to speak to a tech to run by them what happened and ask if they can check w/ a vet.