Above) This soulful pup is a "chug," half chihuahua and half pug, is named Oliver. Chugs tend to be very intelligent and independent. Some of the issues chihuahuas have, like neurological shivering or fragility for the smallest ones, and issues that pugs have, like eye troubles cancers and infections in the fold of the flattened nose, tend to vanish in a chug which is a sturdy animal of high intelligence.
Below) When Coco was first offered for adoption, he was listed as half longhair chihuahua and half pug, though to me he looks less like a chug than a cheeks (half pekingese) which have the underbite. He was described as lively and smart.