We have a 15 year old who started recently. Once we found the correct dosage it made a huge difference in his overall behavior. I found the testing to be trickier than administering the insulin. Ultimately I settled on the tester below, and found it easiest to get the blood sample from the ear tip. After about a week, we developed a good system for the testing as well. Best of luck!
AlphaTRAK 3, 8 Piece Pet Blood Glucose Monitoring Kit for Diabetic Cats and Dogs, All-in-One Solution for in-Clinic Or at Home, with Digital Results https://a.co/d/gvL9AcS
I’m also going to add that any online service you sign up for, always check through their privacy settings and make sure the options to not gather data are enabled. Another one is to check through settings for your ISP and cellular plans. Some collect various data to “enhance” services. Lastly I’ll mention that on mobile devices switch to a privacy oriented browser like the recommendations below, and use Progressive Web Apps instead of native apps. These will include the browser’s privacy protections by default.