Is pet breeding a profession or a hobby for you?
It’s a hobby rather than a career. But it basically boils down to how much income you can generate from it. There’s virtually no way to make money breeding, for example, dogs, if you do it ethically and humanely. The only way to make money breeding pets is to cut corners. The IRS would consider this a hobby though the person doing it might consider it a side job or part-time business to supplement another source of income.