DKA is essentially not enough insulin + not enough food + an inflammation or infection happening somewhere.
Ketones, Diabetic Ketoacidosis (DKA), and Blood Ketone Meters
To combat DKA, you need to feed Charlie 1 1/2 times the amount of food that he normally eats. And as much fluid as he will take. You can add water to the food to make it soupy. Fluids help flush out the ketones.
If Charlie does not want to eat, try some of these suggestions:
I'm going to paraphrase
@Bron and Sheba (GA) since she writes about DKA so well.
A lot of Canadians use the FreeStyle Lite meter. Strips are quite expensive in Canada. If you have any PC points, you can use this for this purpose.
Tips to catch and test a urine sample
You can pick up keto sticks at any human pharmacy. I believe they are called keto diastix.
Some questions:
Did the vet send Charlie home with anything other than the Prozinc?
Did the vet tell you that the ketones were gone?
Did the blood work show any kind of infection or inflammation?
Did the vet give you any idea of the blood glucose numbers? (Most of the forum members post U.S. numbers instead of rest-of-the-world numbers.) You multiply Canadian numbers by 18. Once you have a spreadsheet up and running, the spreadsheet does it for you.
Was Charlie eating at the vet?
Why only 2 kinds of Fancy Feast? There are plenty of low carb foods. With ketones in the mix, just feed Charlie whatever he wants to eat (with water added if you can). Food is an important tool in combatting DKA.
Here is the link to the Food Chart. Not all varieties are available in Canada. Note: in Canada, Fancy Feast Classic is called Fancy Feast Pates.
Canadian specific foods can be found here: