Vets always have a higher range of numbers because they aren’t available to you 24/7. For us, 150-250 is too high and you’ll never have the chance to get him into remission at that range. Plus, those numbers are getting over the renal threshold which is the point where the kidneys can’t handle all the sugar and it gets dumped into the urine.
The tools to keep him from “crashing ” is testing and food. That doesn’t mean his BG might not got lower....sometimes they surprise us as you saw the other night but you caught the slide!
You might want to look at the
Start Low Go Slow method. This mentions Lantus but it’s the same for PZ.