As a question it means, "Who wants a pet?" As a dependent clause, it means, "...who wants a pet."
Tienes una mascota?
"Who are you?" -
Tengo una mascota.
Tuve una mascota en el cuarto.
Yo no tengo mascotas would be the best way to say "I do not have any pets" in Spanish.
"A person who is any good"
Hola busco una mujere que quiere conmigo
The cast of Como quien pierde una estrella - 2005 includes: Jorge Aldama Dacia Arcaraz Roberto Ballesteros Rogelio Guerra
It means, "Who is in a wheel chair?"
quiero ir a una fiesta
Yo tengo un, or una, perro (boy dog), perra (girl dog). pronounce "pero and pera" like pair only with an o and a. The more general "I have one animal" would be "Tengo un animal". If you mean "I have one pet", it would be "Tengo una mascota".
I think you are trying to say: "Memo: I have a call from your phone, and who are you?"