So many unwanted puppies, born because people can't be bothered to neuter their dogs. Or breeders who are after the 'perfect' one which will win Crufts! Or galgueros who want the champion. Thoughtless selfish people who don't really care about the dogs.
Most of the animals I have had in my 70 years have been neutered, dogs, cats, horses. Not the ducks, hens and geese of course!!
Here's an article raising the question 'to neuter or not?'.