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I have. Animals die. Animals disappear. When I was a child we had eight cats, all living in the barn. I loved them all, but my father made it very clear to me that we could not afford vet visits for them. When they got sick or injured we did our best to make them better, but if we couldn't, we put them out of their misery. It was an awful awful decision to make, but we did it because we had to.
Interestingly, as an adult I had to make the same decision about my father. That really put the whole cat thing into perspective. Animals are not people, and the same rules to not apply.