A1c last week was 5.0, better than my wife’s non diabetic 5.4 
For the cat, they recommend the ear (which i dont do) or their pads. He seems to like the big pad on his back left foot. Cant get him anywhere else. I don’t count carb, but i give him high protein food that i weigh. if i change his food, then i feed him a couple times and run a curve testing him every hour for 12 hours. Then its a matter of judging his pre-prandial number with insulin dose. so for example, if he is 150 he gets one unit. 200 he gets 1.75 units. He is pretty stable with that although every now and then he runs around a little too much and has gone low and gets a little corn syrup. His doc would prefer i keep him up around 300 but cats are ok down to 50. I keep him around 100-200 on his current regimen. its taken me a few years to work out his program, but me getting D has helped a lot in my understanding of his treatment.