Who has successful experience in breeding Chihuahuas? Can you tell me about your experience?

Every year starting from mid-March for about a month is their estrus period. During this period, the success rate of mating is relatively high. Of course, you’d better find a Chihuahua of the same breed to mate with. Because Chihuahuas are generally not big, you have to consider the problem of giving birth to her after conception. Compared with larger dogs, it is easy to cause dystocia during childbirth. You should also pay attention to controlling her diet during pregnancy, such as calcium intake and so on. My Chihuahuas have been bred to the third generation. This is the conclusion of my observation. Thank you