@loughbee Hi , I used to use the Libre on my dog. I had the ap on my phone but I also got a reader.The reader was left at home with the dog. If she wasn't at home I was always the one with her so I had my phone to use.
I also used the miao miao and the tomato ap so I could calibrate it and have alarms. The Libre on people is off and can be quite far off especially the first day. You have a tendendcy to keep a dog at a higher BG level and the Libre is more "off" at higher numbers. Plus a dogs body system is a little different than a person. So we still would do a blood test as needed. The first day importantly, plus if I had numbers that didn't look like they were right and I needed to do an adjustment. I really suggest at least one test a day. I realize some dogs are harder to do than others. The Libre gives you a lot more information than you would have otherwise, but it can be off.
By far the easiest way to do a blood test, but my dog was really passive about it, is using the inside of her lip.
They have the Libres that have the alarms now, my dog would randomly sometimes drop at night so it was a blessing to have alarms. But you would need something like x drip etc to be able to calibrate it or I think a lot of people use Bubble now instead of Miao Miao. Probably if you post what is the best ap to use to calibrate the Libre, a lot of people will give input. It's been a couple of years since I had to deal with it. I still miss my dog a lot. Anything I can help you with I will be more than happy too.