Hi, Tiger he's 17 for about a week now has been drinking more water and acting a little lazy, not lethargic. Haven't taken him to the vet yet. I checked his glucose at home(I have a sugarcat named Jazz Man) with Reli on meter. It read 450 about 15mins ago. I'm going to give him his dinner in about an hour. Should I just go ahead and give him 1 unit of Prozinc while he is eating? He doesn't have a problem eating ff pate. We know he's high right now. Or should I wait a half hour after he eats and retest. Then if still high give him 1 unit or .5 to start with? And recheck in a couple hours?