Over 10,000 cats are killed/pit down in shelters every year ad cats that live on their own prob.1,000-5,000 so don't bye a cat find a homeless one and find bunches and make ur own special habitat and...
Millions! If you mean lost, like going to doggie heaven, then that's a lot! There are lots of high-kill shelters that put up to 10 dogs to sleep a day(euthanasia), and there are also a lot of dogs...