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You did everything right, loving and caring, I just made 2 postings about my dog who died last year. And would invite you to read them and especially my conversation with @dswigle there in the comments.
Reading her lines helped me so much with this topic, so maybe it can help you too
https://ecency.com/hive-109288/@beeber/one-year-ago-still-missing

I read your post and commented. The loss is always so amazingly painful. With rats they only live for a couple of years. I try to go into it thinking about them like that, and just enjoy their short company. But some leave more lasting imprints than others, for sure. ♥️

The pharmacy failed. Not you. You did everything right.