Clipped! Haha love it!
It’s not necessary for either of those things. It’s done in the real world for the same reason it’s done in the fluffy world - because people (for various reasons, there are some valid ecological reasons but mostly a bucketload of unimportant shallow reasons) don’t like feral animals wandering around, and also as a means of control
That would just drive the prices up and they’d be back in the same inaccessible place as where the timeline started