Pregnancy in a Chihauhau

Question
I have a Shichi(half Shitsu/half teacup chihauhau)about 5 lbs or less.Will a male dog mate who has been neutered? One got in my back yard when my female was in heat. For smaller dogs, is the gestation period onger/shorter? Info I have gotten says 4weeks to 63 days?

Answer
Male dogs who have been neutered can sometimes breed, but they cannot produce pups. The gestation period for all dogs is exactly the same no matter the size., it's alway son average 63 days from mating.
Your little dog sounds adorable :) If the dog was really truly neutered, she's safe.
Cindi