so they don't fucking kill each other over who gets to be the alpha.

[There should be a GIF or video here. Update the app now to see it.]

Puppies, without the attention of their mother, will die. Dogs who get infected from wounds, will die.
And that's just an example of DOGS.
A lot of species are like this when they are not neutered.
It pisses me off so much that people won't neuter their pets. It's a danger to their health. And unwanted kittens/puppies/babies will DIE.