A molera is a "hole" in a
Chihuahua's head; it is the same as a
in human babies. Historically, the Chihuahua as developed in
Mexico and the
States has displayed a "hole in the head". In times past, this has
been accepted as a mark of purity for this
and it is still mentioned in most Chihuahua breed standards the world
over. The bones of the head in all foetuses are not firmly knitted
together, but in most mammals, the different bones of the skull join
with cartilaginous sutures as the animal matures. The Chihuahuas'
moleras vary in size and shape, occurring on the top of the head where
the parietal and frontal bones come together.
The simple fact that a Chihuahua has a domed head with an open molera does
not predispose it to
as found by a study done by Greene and Braund in 1989, which concluded that
"Many clinically normal toy breeds and brachycephalic (short faced) breeds also
may have open fontanelles without associated
Also, "There did not appear to be any relationship between the presence or size
of the fontanelle and the concomitant presence of hydrocephalus." When the dog
seems normal but displays enlarged ventricles of the brain (under ultrasound),
its hydrocephalus is termed "occult" (having no clinical signs).
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