About 6.5 million companion animals enter U.S. animal shelters nationwide every year. Of those, roughly 3.3 million are dogs and 3.2 million are cats. The good news is that these numbers are a result of a steady decline—according to ASPCA estimates, there were approximately 7.2 million dogs and cats entering U.S. shelters annually around 2011. And while 710 thousand animals who enter shelters as strays are returned to their owners, 3.2 million are adopted.