Tom,
Actually they are sort of right about how we test our cats, by using a lancet to prick the edge of their ears, but you don't shove it all the way through anymore than a human diabetic shoves the lancet all the way through their finger when they test their blood sugar..I've seen my cats do more damage to their own ears with a claw trying to scratch an itch.
I, personally have 2 diabetic cats...Musette my insulin dependent one has had her ears tested at least 6 times a day for the last 7 months, and sometimes up to 10 times a day, and unless I have just tested her and there is a little bit of dried blood on her fur, you wouldn't know what ear I was testing. They are just as pretty as the first time I laid eyes on her.
Musette also wasn't my life long friend and companion before she got diabetes, I adopted her 7 months ago as a diabetic after her first owner wanted her put to sleep rather than have to treat her. But you know what, not only does she come for snuggles and cuddles, she sleeps curled up on my pillow and wakes me up in the morning with whisker kisses and head butts all the time purring madly and making biscuits. Now do you really think if I was hurting this kitty 6 to 10 times a day, everyday, for the last 7 months without having any former relationship with me, she would be so loving towards me? But she does, and more than that if I'm running late on a test she comes and looks for me, and when I get her test kit out she climbs in my lap purring away to wait for her test and she purrs the entire time I am testing her.
Now Maxwell my other diabetic who I also adopted as a diabetic rather than see him put down for just being a little extra sweet has been in remission for over a year now. But when I first got him, he had only recently started on Lantus and had just had his diet changed to low carb canned food from a high carb dry food diet. The woman tha fostered him and the vet that started treating him while we set up his transport are very familiar with diabetic cats, in fact his foster mom currently has 7 diabetics that she is treating with insulin. So she started him on 1u twice a day before he came here...but after he arrived I only gave him 2 shots total, one of his full dose and one of half a dose and he never needed another shot now going on 16 months...but if I hadn't been testing him from that very first night that I picked him up at the airport, and just blindly kept giving him that standard 1u twice a day at the very least he would have hypo-ed if not worse. Because I didn't know him well enough in the beginning to know what normal behavior was for him. I only knew him as a sick cat. But even after being put on a plane and shipped across country to a woman that the very first thing she did was pull out a lancet and prick him in the ear, Maxwell is currently sitting here trying to convince me it is time for bed and he is sleepy...but he won't go to bed until I do, because he sleeps curled up either on my pillow or draped over my neck every night.
Neither of these cats had any reason to trust me in the beginning let alone grow to love me, and surely if I was hurting either of them by testing their ears, they should run from me everytime they see me, but they don't. I have 11 other cats besides them, and if you didn't know which of those 13 cats in total were my diabetics, you wouldn't be able to tell who they were by their behavior towards me.
Mel, Maxwell, Musette & The Fur Gang