Whether you buy a pet or a boxer for sport, you should first make sure the parents have been health tested at least heart and hips.
Below are other requirements that some owners also test for.
The American Boxer Club has a Testing and Reporting Recommendations and the Boxer Klub in Germany has requirements for heart tests, hips and spine testing for breeding stock. Make sure you get results from the breeder you intent to purchase your boxer puppy from, whether is for a pet or for sport. You should have a healthy puppy.