I am afraid I know of quite a few people who would put thier own dog to sleep or get rid of unwanted pups, I remember my father in law doing it when his dog got old and very recently other people my age who were farmers have done the same, particularly with ill or old dogs..I also remember a chap staying with us who had an accidental mateing with his white German Shepard, he could not sell his pups so said he would get rid of them...no it still goes on....and sometimes unwanted humans go that way as well