That is what animal shelter workers tell everyone. It is in their employee handbook to say this to every person that surrenders a pet. The truth of the matter is that animal shelters are in every city and on average they take in more animals than they adopt out. My local humane shelter wrote that they have room for 125 cats and 275 dogs and took in 800 animals in August this year. When I asked what happened to the excess animals I was told that 100 were adopted, other animals went to fosters and other pets that did not meet the standards of the shelter were euthanized.