My cat Ramon's BG has registered normal today. This am it was 130, then 2 hours later it was 227 so I gave 1 unit of Prozinc. At the +8 hour time he was kind of lethargic so I tested then and it was 276. Now at the 12 hour mark from when he got the 1 unit I have tested and its 161 (and he even recently ate). What do I do right now about his insulin? Do I give .5 unit or nothing? Or wait 2 hours and retest to see if its back in the 200's? Please advise. This rollercoaster of levels is confusing.