Deep breaths, hold, release, deep breath, hold, release, ..........................
We know how very stressful and worrying this must be for you. Please, understand that we are here for you. We know a lot about feline diabetes and think we can be of great help to you. Sending you some big hugs to help you as you begin this journey with your diabetic cat.


It took time for your cat to develop diabetes. It will take time for your cat to get better. One saying we have here is "This is a marathon, not a sprint." Give it time. Cats can live successfully, happily for many years with diabetes.
I can certainly understand why you are confused. Conflicting advice from 2 different vets at your vet office is confusing you even more. Telling you to only listen to one vet, not knowing if 1 of the vets is more experienced with treating feline diabetes in a cat than the other vet. They should at least be talking to each other?!?!
Plus, you are trying to learn more here on this forum about how to better treat your diabetic cat.
There was a study done many years ago on lantus insulin, the Roomp & Rand protocol, scientifically based, vet journal published, updated since the original publication. We have 2 protocols we use here for managing cats using Lantus insulin.
The first protocol is TR (Tight Regulation) that was developed and modified from that original R&R protocol. Modifications were made based on the experiences of hundreds of cats here.
SLGS (Start Low, Go Slow) is the second protocol we use here to mange a cat using Lantus insulin.
Take a look at this document, that explains the 2 protocol methods.
Sticky: Dosing Methods: Start Low, Go Slow (SLGS) & Tight Regulation (TR)
The second vet this morning is correct, with the recent DKA episode you do not want to SKIP shots. That can lead to another DKA episode. Classic setup for ketones forming and then leading to DKA is not enough insulin + not enough food + an infection or inflammation somewhere in a cat's body (UTI, bad teeth).
Getting enough food into Arya and some insulin is more important right now than getting her regulated. The hepatic lipidosis (HL) and the recent DKA combined make it more urgent to get sufficient food and insulin into Arya every day.
Doesn't matter that Arya is eating higher carb dry food right now. Whatever she will eat, and eat well and eat enough of is more important.
Here is a document that talks about the "depot" effect of Lantus insulin.
Sticky: What is the Insulin Depot?
Lantus has a "depot" or storage area. Crystals form underneath the skin and then some of the insulin is slowly released over time. Changing the dose from cycle to cycle or skipping the dose, will let the "depot" storage area drain a bit. That is one reason why you are seeing such wild swings in the BG levels. Skipping shots and changing the dose is doing that.
The 4 units was obviously too much. IMHO, your vets do not understand Lantus insulin use in cats. Raising the dose of Lantus from 1 to 2 to 4 units over the course of 24 hours was inappropriate. It's no wonder that Arya is bouncing all over the place. She is on a roller coaster ride, up and down and up and down.
Even a tiny bit of insulin, like 0.25U may be safe for Arya when the BG levels are low, like they were this morning.
Getting more BG (blood glucose) tests at home will help to see when Arya's onset and nadir occur and will let us see the duration of the Lantus insulin in YOUR cat.
Do you have plenty of Alphatrak test strips? A couple of containers of 50 strips would be appropriate.
The dry food that Arya is eating is probably the only thing that kept here from having hypoglycemic symptoms and is keeping the numbers high with that 4U dose. DO NOT CHANGE THE FOOD AT THIS TIME. You need to stabilize Arya and get her eating lots of food and have the hepatitic lipidosis resolve first.
Hang in there. The first couple of weeks with a diabetic cat can be intense, learning all you can to help your Arya feel better. We understand what that is like. We have all had diabetic cats at one time.