How Old Are Chihuahuas. Reasons for delaying this would be if the chihuahua is undersized and struggling with weight issues. This is much later than other breeds who reach senior citizen status at around 7 or 8 and in the case of giant breeds 5 to 6.
If your chihuahua is only carrying one or two puppies, though, they can grow uncommonly large, making it even more difficult for the mother to give birth naturally. Chihuahuas usually get close to their adult size by the time they’ re six months old. Is 11 old for a chihuahua?