In the U.S millions are put down.
Four million cats and dogs-about one every eight seconds-are put down in US shelters each year.
Too many sadly...I am a dog cat lover and i feel sad, mad, hurt
Used this answer from another site I don't think we have a system that can track a very accurate total figure. It is widely accepted that 9.6 million animals are euthanized annually in the United...
The number of dogs in the United States in 2001 was 60 million, and cats numbered 75 million.