Step 1 : Introduction to the question "4. Why is it frowned upon to earn a living breeding dogs?"
...1. There are better jobs out there 2. Cat breeding is worth more 3. Dogs are not worth much money 4. No reputable breeder makes a profit through breeding Breeding reputably is very expensive and includes costs such as genetic testing, show entry fees, potential emergency vet care, vaccination fees, stud fees, etc. At the very most a reputable breeder can expect to meet their costs.