I also believe it is deceptive and unethical to twist, distort, skew or co-opt the words "adoptable" and "unadoptable." A shelter animal is unadoptable if he or she is suffering or so irremediably ill that palliative care is not feasible and euthanasia is the only ethical choice to prevent suffering. An otherwise healthy shelter dog is unadoptable if he or she is genuinely a danger to the public and there is no sanctuary placement available for that dog. There is a continental divide between dogs who are genuinely dangerous and dogs who are simply scared, traumatized, under-socialized or not doing well in a shelter environment. Studies have shown that dogs don't behave in shelters the way they do outside of shelters or even just outside. The National Canine Research Council explains evaluation of dogs in shelters this way:
On September 21, 2016, a healthy 1 year-old Boxer-mix named Jackson was destroyed at my local animal shelter. The shelter was very up front about it and went so far as to post about his death on their Facebook page. I was appalled not just that Jackson was dead, but that his demise was written about in such a way as to make the public think his death was unavoidable. The most offensive statement in the post about his death was this: "Jackson is finally at rest and away from the chaotic world we live in now." No. Jackson is dead because the shelter failed to engage in adequate rescue liaison, failed to keep him from developing shelter stress through adequate behavior programs, failed to find a foster home for him, failed to market him adequately to the public and failed to fully embrace no kill programs which serve to limit the number of animals in the shelter at any given time. The report from the shelter which sets forth data on dogs destroyed in September makes it hard to determine which one was Jackson. I'm pretty sure he is listed as a 2 ½ year old pit bull type dog destroyed for severe behavioral issues. And I'm very sure he was killed because it was just easier than keeping him alive.
If you are told your shelter is No Kill, ask questions to find out what that really means. It may just mean that the words adoptable and unadoptable have been co-opted to the point where they no longer mean what you think they mean. And it means that if your dog or cat ended up in the shelter for some reason, he or she could easily be labeled something they are not and destroyed for no good reason at all.