http://www.felinediabetes.com/FDMB/threads/switching-to-lantus.190542/#post-2124840 My cat has become so extremely hard to test. It use to be so easy. Now he is biting, hissing, swatting at me. This morning before my husband left for work, he held him down and I couldn't get his ear to bleed after several pokes then Butter went nuts, he finally had to let him go. I have not cried during this whole journey that started last May but I am now having a breakdown. I switched him to Lantus about a week ago. Vet suggested that I start him on 2 units. She gave me new syringes. I went from U-40 to U-100's. This new syringe is so tiny and the needle is so much smaller that I have no idea if he is even getting any insulin. With the U-40, I felt the needle go in and it took a second to push in the Prozinc. I don't even feel the needle go in him and the insulin is such a small amount I feel like it might be in his fur. Since the switch to Lantus, I have no idea if it is too little or too much as I can't test him anymore without a huge scene, me crying and him running away angry at me. This is just awful I am attaching a pic of the syringe. If the Dr. recommends 2 units is it just the 2 very top lines? It seems like nothing! Not to mention drawing the insulin from the pens has not been easy. I'm not even sure if I have it in there sometimes, it is such a tiny amount. It was so much easier administering the Prozinc with the U-40's a the 4.5 units. I am so upset and I have spent so much money on him. I just want to get him better!