Hi all, For the last month, Nana's nadir at 4 hours has been between 150 to 180. I got a new vial a Vetsulin from the Vet last Thursday and her nadir was at 310, 330 on Thursday and Friday. I thought maybe that vial was bad so I ordered a new one. Same thing, her BG isn't dropping like it used to. I took various time points yesterday and her BG is like a flat-line. Hovering in the 330 range all day. I checked her for UTI and ketones and everything is negative. I have no idea what caused the Vetsulin to stop working. The only change is I'm giving her Wysong 90. But she has been eating that for almost 2 weeks now. Any insight?