People.com said the film star made the remarks during a taping for Thursday's edition of "The Ellen DeGeneres Show."
Asked by DeGeneres if she is going to adopt another dog, People.com said Aniston replied, "I think you're confusing that with the Mexican child I'm supposedly adopting."
"Oh, are you going to adopt a Mexican child?" DeGeneres inquired.
"No, I'm not adopting a Mexican child," the single actress answered, joking that Adam Sandler "adopted four last week and that never even got mentioned. No, I'm not adopting any children. ... And no doggies right now."
Aniston and Sandler co-star in the new big-screen comedy "Just Go With It."