MACULA? nobody mentioned about macula... maybe you meant MOLERA.
and to touch on MOLERA (in case mao jud ni imo pasabot), as per the AKC Breed Standard regarding the HEAD standards of a chhuahua, it says - "
A well rounded "apple dome" skull, with or without molera."... In the past, this molera has been accepted as a mark of purity for this dog breed, however, as you can read from the current standards itself, MOLERA has been considered as not the end all and be all of determining "pureness" of this breed. even without the obvious presence of MOLERA, a dog can still be PURE.
ang MOLERA man gud, mu-hardened man sad kadugayan.. some of my chis, i cant fel na ila molera, but that does not mean theyre not pure anymore. just like sa tawo, diba kato baby pa ka, obvious kaayo ang "bumbunan" nimo? pero karon, can you still find that soft spot on top of your head? diba wala na? dili pod pasabot ana, dili naka pure na tawo diba? jokes hehe
incidentally, ako gi-google imu MACULA (kay wala pod ko kasabot unsa ng MACULA).. mao ni ako nakuha from wiki ay:
The macula or macula lutea (from Latin macula, "spot" + lutea, "yellow") is an oval-shaped highly pigmented yellow spot near the center of the retina of the human eye.
so obviously, MOLERA jud diay imu pasabot, dili MACULA.