Phantasm: Dog: Wait for a different family.
From Create Your Own Story
When the family comes near your cage, you bark and growl viciously at them. This is enough to scare them off it seems, and you happily lie down to wait for the next family. Weeks pass, however, and no more families show interest in you.
One night while you are sleeping, the blonde nurse comes into your kennel. Before you have a chance to awaken, she takes you into the back room and euthanizes you. Apparently you weren't adoptable enough.