Fairly early on in the game, one's animal screen becomes a complete mess, containing animals, their babies, and random pets that the migrants brought. Ideally, I would start an animal eugenics program and butcher everything except a few dogs, cats, chickens, and pigs. However, it is impossible to butcher the pets and they, along with the babies, clutter the screen. Is there any way to de-clutter and manage the animals, especially if it involves killing the pets?

Fairly early on in the game, the animal screen becomes a complete mess, filling up with animals, their babies, and the random pets brought in by migrants. 

Ideally, I would start an animal eugenics program, and butcher everything except a few dogs, cats, chickens, and pigs. 

However, it is impossible to butcher the pets, and they continue to clutter the screen. 

Is there any way to kill the pets, or manage the animals?