My cat fonzie was diagnosed with diabetes in Mid October after he was given a Depo-shot by a vet (that should have known better!). We had to keep increasing his units of Lantus to bring down his blood glucose levels. We did this slowly and responsibly. One week ago I noticed he was acting tired and tested his blood AFTER giving him 4 1/2 units. He tested at 67 - ugh - terrible night - up all night, at 2:30 am he got down to 52 and then started coming back up again. I usually don't test every time I administer Lantus but have started since that happened. On 2/25 he tested at 267 and my vet told me to give him 3 1/2 units of lantus - which I did. I tested him 13 hours after administering the 3 1/2 units and he was at a 65!!! I wonder how low he actually got overnight. Now I am at a loss. He usually stays low for about a day and then within 3 days is nearing 300 again. Is there a lantus protocol I could follow? Sometimes the vets are not even available when the BG level comes back questionable and I don't know how much to give him. Any advice would be appreciated!