vs 

QUICK ANSWER
"Chihuahua" is a form of "chihuahua", a noun which is often translated as "Chihuahua". "Ay" is a form of "ay", an interjection which is often translated as "ow". Learn more about the difference between "chihuahua" and "ay" below.
el chihuahua, la chihuahua, chihuahua(
chee
-
wah
-
wah
)
This means that the noun can be masculine or feminine, depending on the gender of the noun it refers to (e.g., el doctor, la doctora).
masculine or feminine noun
a. Chihuahua
Tenemos un chihuahua y un ovejero alemán de mascotas.We have a pet Chihuahua and a pet German shepherd.
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
2. (used to express surprise or anger)
Regionalism used in Mexico
(Mexico)
a. dang
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
¡Ay, chihuahua! Se me olvidó cerrar la puerta de la casa.Dang! I forgot to lock the front door.
b. shoot
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
¡Chihuahua! Se nos acabó la leche.Shoot! We're out of milk.
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ay(
ay
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. ow
¡Ay! ¡Acabas de pisarme el pie!Ow! You just stepped on my foot!
b. ouch
¡Ay! ¡Cómo duele!Ouch! That really hurts!
a. oh dear
¡Ay! Me han robado todo.Oh dear! All my things have been stolen.
b. jeez
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
¡Ay! Me asustaste.Jeez! You scared me.
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
a. cry
Su ay se oyó en todo el recinto.His cry could be heard everywhere.
b. moan
De repente, el perro soltó un ay de dolor.All of a sudden, the dog let out a painful moan.
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