What two breeds of dog make a Boxer?

boxer's are a breed of there own

Actually, boxers (like many modern breeds) did originate by mixing other Dog Breeds.

"The Boxer is part of the Molosser dog group, developed in Germany in the late 19th century from the now extinct Bullenbeisser, a dog of Mastiff descent, and Bulldogs brought in from Great Britain." (from Wikipedia)

FYI - this is a perfect example of how you should think twice before believing an answer that is written with so many grammatical errors ;)