Advice or tips for grieving a pet?

I’ve had a cat for 12 years, I love her very much. She’s had a lot of health issues over the last few years and even though she’s on medication, her health is still declining. I’ve had to make the hard decision to get her put to sleep at the vets next month. I have a month to prepare for the loss.

I’ve lost many pets in the past, family cats, rabbits, etc, but I’ve never had this much love and bond with a pet before, so the loss is going to hit me much harder.
Advice or tips for grieving a pet?
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