just want to add that in a potential overdose situation lantus' duration can be extended. so you may need to test past +12 and test more carefully even after the next shot because of overlap.
sometimes, tho, an overdose situation becomes a non-event. i gave cleo a double dose once and panicked but her numbers went high because her system fought it off. some other cats' numbers have dropped very low and they had a big fight getting them back up with food.
so test and check, and don't drop your guard, but this can turn out okay.
add a few more tests even after the next dose of lantus, okay?
you probably are not going to give the next shot tonight, but ask others for advice on this when shot time comes, okay?