Facebook reminded me this morning that on this day last year, we brought Sylvie home from an overnight at the vet.

On the Saturday night, she’d had an episode. I heard a fall and woke up to find her on her side. The carpet underneath her was wet. We took her to the regular vet on Sunday, and they suggested we take her to the emergency vet, where she was diagnosed with pulmonary hypertension and sent home with meds that we hoped would work.

They didn’t. After a week of almost normal be...