Unfortunately I have had similar experiences at the SPCA over many years of volunteering wherein I was allowed to walk dogs in the public which were deemed adoptable and then suddenly they were deemed unadoptable and euthanized or they would be transferred and I couldn't find out their fates. I found that there was too much secrecy at the SPCA's I volunteered at and too little interest in the animals. They seemed to be more intent on just getting them through their system. in the last couple of years, some of the staff seemed to care, but before that no one but the volunteers seemed interested in the animals at all. The way the cats were ignored in their cages and kept disappearing in batches was so upsetting to my wife that she stopped going. My wife and I are now volunteering at a no-kill shelter where the animals are treated by everyone as though they are their pets, not just commodities to be judged and sold or not sold. That is the conclusion unfortunately that I came to.