Charley was diagnosed with diabetes in October. It's been difficult getting him to the correct level of insulin. Charley also has some other issues with eating and constipation, so my vet referred me to a specialist. He is now getting meds for his constipation, and his insulin was changed from PTZ-40 to Lantus-100. The new vet also wants me to check Charley's BG at least twice a day. I bought a CVS store brand (True Metrix) glucometer, and only got it to read one time. I keep getting error messages (not enough blood) though the last drop was very large. Maybe it was positioning problem, I don't know. Does anyone have a recommendation for a glucometer? I've watched the instruction videos on Youtube, and have to say that it's a little more difficult than it looks. Any advice is much appreciated.