Hi, welcome to the board.
This is the absolute BEST place for boxer information, support, laughs...
We also have a white boxer, Remy. He's 8 years old.
White boxers are "known" for a "tendency" to have more health problems. That's a generalization and not a 100% sure thing your white boxer will have more problems than a colored boxer.
As for showing, the AKC standard for boxers states that a boxer may not have more than 1/3 of its coat white, therefore white boxers are excluded from comformation showing.
If you're interested, I have a website where you can see Remy.
http://www.geocities.com/jonzinboxers/index.html?968733425190
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Linda
Remy -DOB 6/2/92; white male w/brindle patches;
Bailey - DOB 10/16/99; flashy brindle female
Shannon - 1992?-12/7/99 Flashy fawn; We miss her!