Not sure how acurate this is now because this stat is from about 10 years ago so I'm sure the numbers are now higher...but 10 years ago to give every cat in the US a home...each person (not family...each PERSON) would have to take in 21 cats and 7 dogs....that would mean a family of 4 would have to take in 84 cats and 28 dogs.Breeding can be done if it is done RESPONSIBLY...letting your animals slip out and opps,your pregnant is not a way to go about it.If all the unwanted pregnancies alone were avoided,imagine how many less unwanted there would be.I think a big problem is also when the "newness" of the pup or kitten wear off of most people and the animals get into their "terrible 2's" they just give up and get rid of the animal.