If PETA had billions of dollars and spent all of it on building animal shelters for every single dog and cat, breeders and feral animals would quickly replenish the missing "stock". There will simply never be enough "animal shelters" to house every animal ever born. PETA offers euthanasia services because of this truth. I see nowhere on their website that states that they set out to provide shelters for all pets. There are many rational criticisms of PETA, but this is not one of them.