What is the name of the animal with a fox like tail that comes from Mexico?

Because of the lack of detail in your question, all I can do is hazard a guess.

The Grey Fox has a fox-like tail and is found in Mexico and Southern USA. (Canine).

The Coyote has a fox-like tail and is found in Mexico, USA and Canada. (Canine).

The Chinchilla has a small bushy tail that looks like a baby fox. They are found in Mexico, Chile, Andes and Peru. (Rodent).

The Ringtail Cat is a wildcat with a bushy fox-like tail found in Mexico and South-Western USA. (Feline).