If a smooth coat chihuahua mates with another smooth-coated chihuahua and one of them has a hidden long coat gen, they can have both smooth and long coat puppies.
If a smooth coat chihuahua mates with a long coat chihuahua, they can have both smooth and long coat puppies.
If a long coat chihuahua mates with another long coat chihuahua, they will always have long coat puppies.
Due to genetics and to the fact that the breed is not fixed yet, two chihuahuas the same size can have puppies of a wide range of sizes.
