We still do have a "dog tax". Every few years, I must license my 4 dogs. It's discounted (much cheaper) if they are spayed or neutered.

Dogs that come in to the shelters which are not tagged/licensed are unfortunately given very little time before they get the gas chamber. IF an owner comes to claim one of them, they are slapped with a fine, mandatory spay/neutering bill, AND have to pay for tags on top of that.

Seems to be working just fine here.

About the captive breeding comment, I was only suggesting that it's better to have the species exist only in captivity, than to not exist at all.