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The original was posted on /r/tifu by /u/TinyFox1399 on 2026-02-26 13:06:21+00:00.
My sister has a very cute old cat who has been eating everything she can find and therefore she has gotten pretty overweight.
Since moving out and getting two new kittens, my sister started to monitor which cat eats what, so the older cat wouldn't eat the kitten food. I also tried to get the cat to exercise with mixed results, but she has been dropping a considerable amount of weight.
This was when we started to feel a "clump" in her chest. We thought she had a tumor, so I drove her to the vet and the vet (who only spoke our languague in a broken way) didn't really get what we wanted from her. After a while (and after using google translate), she realized that we were just stupid and had mistaken the chest-bone of the cat for a cancer. This cat was so overweight, that you couldn't feel her front bone and we were too stupid, to realize.
TL;DR: Out cat was fat - it lost weight - we thought she had cancer - turns out it was just a normal bone that all cats are supposed to have.