Would you out your pet down or wait til the end?

I have two pets, a cat and a ferret, it's gonna be one soon cause my cat is diabetic but I know she also has kidney failure, I gotta poke her with insulin every 12 hours but I can see the kidney failure is getting to her, she's limping and drinking a lot of water and pissing water basically, she's old but we refuse to put her down like we did with the other cat because after thinking of it, I wouldn't want someone choosing to put me down if they don't know what I want so you know
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Would you out your pet down or wait til the end?
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