Until what age could a female chihuahua be pregnant?

I want to have puppies

After a year...before that, they are still puppies, themselves.

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BE VERY CAREFUL BECAUSE CHIHAUHUA'S HAVING PUPPYS IS A PAT TIME JOB. MANY CHIHUAHUA'S WHO BECOME PREGNANT LOOSE THEM BECAUSE THEY ARE SO SMALL ITS HARD TO CARRY THEM. I AM A VET TECH AND THE MOST A CHIHUAHUA CAN HAVE IS 3. ONE CHI CAME IN GIVING BIRTH WITH 4 CHI'S AND ONE DIED AND ANOTHER ALMOST DID NOT SURVIVE. MANY CHI'S END UP NEEDING A CSECTION WHICH CAN BECOME VERY EXPENSIVE. BEST TIME TO HAVE PUPPIES IS AFTER A YEAR BUT AGAIN JUST BE VERY CAREFUL AND MAKE SURE YOU AHVE A GOOD VET IN HANDY.