At this point in our history, there are so many breeds of cats and dogs out in the world that it's hard to keep track of them all.
But while part of that variety just speaks to how animals naturally develop and diverge from each other, it's also true that many breeds only exist because people cracked the code on how to create a dog with their desired look or purpose through selective breeding.
And it turns out there's quite a dark side to this type of breeding to the point that the creator of the labradoodle breed now considers the work that gave him prominence his life's greatest regret.
But as one vet's powerful series of TikTok videos illustrates, the harmful consequences of selective breeding affect a lot more breeds than you might expect. And some of the world's most popular types of pets are among them.