There are so many different reasons people use to breed their dog. I am not going to go into what is the right or wrong reasons to breed. Instead I am going to tell some of the stories of what you may have to experience. Breeding and whelping is not all fun and wonderful. Learning what problems to watch for is very important. Being prepared to handle problems is also important. By not knowing what to watch for and how to handle it you could lose your baby girl along with her pups. These are all true stories that I personally experienced. Some are not pretty so if you have a weak stomach you may not want to go any further.
Started working at a kennel when I was 16. They did boarding/grooming and bred dogs. They bred Cockers, Dobes and German Shorthairs. Being in a kennel there is a lot of barking and such. A female having a litter can get stressed pretty bad. Then to have an inexperienced person (me) watching them. One female got really stressed out and went a bit over board eating the sack. She was a cocker and due to all this she ate the ears off of one of her puppies'..had to be euthanized.. Another one having her first litter..again inexperienced me watching..she got so scared when the first puppy came out she took off down the kennel isle trying to get away from it. Puppy falls out on the concrete unharmed. She calmed down after the second one. All survived that one.
Fast forward some years..Had a MinPin...researched to find a good male (stud fee $250)...drove many miles to get her bred. Weeks later happy to feel puppies moving around..couple weeks later nothing..all gone..learned that moms can absorb their pups if for some reason they can not carry to term.
Fast forward more years, education and experience. Chihuahua goes into labor. Puppy starts to come out. Very large head comes out but shoulder to wide to pass. Rush to vet for section. To late for the puppy. It died on the way. Vet opens female and tried to pull puppy back to get it out. Head to big to come back in. I had to decapitate the puppy so he could get it out. Now being a tech I was in there to help. Not something everyone would have to go through. But possible in an emergency. Never fails they go into whelp late at night.
Friend had pregnant chihuahua go into labor. At the time there was an infection going around in the chihuahua world. Effected both males and females, but caused puppies to die. Female goes into labor owner tried to help pull puppy out but instead pulled its' toes off..All puppies born dead and transparent. I could see the puppies organs because it was that transparent.
Last litter I had consisted of one puppy. Mom did not want anything to do with him. You see he was born with a cleft lip. You think you know all..not. I had one dog with diarrhea took him to the vet and they gave me flaygyl for him. Another one of my dogs got diarrhea so gave her the same...Pregnant mom got diarrhea..Started her on it...did not know it could cause birth defects.
I can go on with other stories but I will stop there. The point is no matter how much you think you know something can happen. Sometimes it can be deadly to pups or mom. Really think before you decide to breed. Is a litter worth the possibility of losing your baby girl? Are the stories above something you want your children to experience?