Victor is your cat and you are paying the vet bills, so you are the one who ultimately decides what you want for your cat.
If you want to tell your vet you are home testing, just say 'I have decided I am doing it and I have already started....I am not comfortable giving insulin without testing first'.
OR you can just go ahead and test and not say anything. What you do at home is your business and you have Victors best interests at heart.
If he wants you to come in for testing you will probably have to say you are doing it yourself.. It is so much more accurate when done at home as the cat is not stressed out like they are at the vet. BSLs are almost always higher at the vets due to stress and when decisions are made re the dose on the falsely high BSL it can be dangerous.
Just take a deep breath and say that is what you have decided to do....but you are happy to share the BSL numbers with him. Stick to your guns.
If you think they will make it hard for you to change the food....just don't tell them. If they want you to buy food from them (which is more expensive as well as higher carb, and if dry, totally unsuitable) just say he won't eat it, he is just refusing to eat it. They can't argue with that. But personally I would just do the change over without consultation with the vet if you think they will make it hard for you. You know it is the best food for FD.
If your vet is against wet low carb food and against home testing, he does not know much about the current treatment of FD.
IMPORTANT. When you change over to the low carb wet food make sure you are home testing because the BSL will probably drop lower and you need to be monitoring so you know if you need to decrease the insulin dose. Take it slowly over a few days.
Big breathes. You can do it!!

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