Fit horses with shoes to help them walk on hard surfaces.
Technically speaking, if you allow Fido and Fluffy to give birth to a litter of puppies you are an Animal Breeder. And it’s not a bad way to make a few bucks on the side either. You could also sell a few calves while running a farm, or help increase the population of an endangered species through your efforts at the zoo. As you can see, there are many ways to involve yourself as an Animal Breeder.
If you already own animals that you wish to breed, you might look for certain qualities in them—speed in a racehorse, or a shiny coat in a particular breed of dog, for example. You research the bloodlines of these animals, and then make matches that increase your chances of a valuable offspring. In addition to performance animals, Animal Breeders breed animals for meat or by-products (eggs, milk). Or, they specialize in increasing the populations of rare animal species, such as pandas.
Regardless of the species, the process is basically the same. You evaluate the animals for traits, health, age, and cost (when you rent a stud, for example). You introduce the animals, and hope for a natural connection. If a natural connection doesn’t happen, or if you don’t wish to bother waiting for nature, you help the process along through fertilization techniques.
You extract semen from the males, insert it into the females, and watch for signs of pregnancy. Once the baby (or babies) arrive, you provide care and arrange for the sale, keeping careful health and financial records along the way.