You somehow seem to know my pets so well already.
Yes, I have 3 chihuahuas. All 3 were fixed ASAP. We never considered breeding them.
The first is a deerface, what people breeding chihuahuas don't want, because she doesn't barely have an 'apple head' at all.
She got in a fight one time and had her hip dislocated, and we couldn't tell other than her slightly limping and crying if you touched her leg. It was better by the end of the day and hasn't happened since then. The second has never had any of those problems. The most recent was given to us by the vet taking care of her, who had her for 2 weeks. He was hit by a car, then surrendered, because the owner couldn't pay for the medical bills ($1000). His entire front leg was amputated. He has none of the problems. Food is available constantly to them, so they have no chance of getting hypoglycemia.
I can't understand why you chose to keep chihuahuas as PETS when there are so many other dog breeds that don't have these problems. Why there are hundreds of other breeds out there to choose from that don't have these problems.