Quick guidance on dosage before next shot?

Good morning,

First post yesterday in main forum. Third day now of Vetsulin. Doctor advised starting at 1.5u based on two bs tests (372 and then 300 the morning following a 2:00pm dose of 1.5).

I'm trying to figure out if we should go slightly lower. Yesterday am bs 377, +4 179, evening pre shot (which we skipped 165). She's now at 337. Wondering if I need to drop a .25 or .5 a unit.

I'm lookin for quick guidance as she's finishing her meal now, if possible. Thank you!

EDIT: I did approximately 1.25 (although concerned I got a fur shot; will re-check bs in +2).