I worked at a vet clinic as a tech for a long time. A lady came in to put her husband’s cat to sleep (husband had the cat prior to the marriage.) She wanted to euthanize the cat because it “slept too much and was old”. The cat was old, but she was also perfectly healthy. Lady told us that if we didn’t put the cat down she’d find someone else who would. We said okay, we agree to put the cat down, charged her for euthanasia and for cremation (she didn’t want ashes back thankfully). Lady leaves and we don’t put the cat down. We keep her as a clinic cat and she lived several more years in good health and happiness before dying of old age. The vet would joke that the euthanasia and cremation costs were “adoption fees”. Anytime the lady would come back to the clinic we’d hide the cat in a back room and snicker the whole time.