we don’t know the whole story
I pulled time in a vet clinic
not all folks are thoughtful of their pets
many folks are too stupid or selfish to have custody of a pet
Many folks don’t have thousands of dollars to spend saving their beloved pet.
Some folks might realize that it might be kinder to euthanize a pet you can longer care for, and that because of its age and/or medical issues will never stand a chance of being adopted and won’t get decent care at a shelter.
I have come to the realization the last few years that there’s a Big Vet to go along with Big Med.
And ethical veterinary practioners, especially in corporate owned practices, are as hard to find as a decent doc in a human health system.