A boxer's diet is comprised of healthy rations of fruits, vegetables, liquids and meat. The proteins here comprise of eggs, tuna, peanut butter and milk while the liquids mainly refer to a regular intakes of water.
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We have a boxer and she eats just about any kind of dog food. She was just pregnant with puppies awhile back, and we are having to feed her puppy food now however so the puppies get the nutrients they need. The best way to find out what they eat is to try different dog foods and find one they like and stay with it.
Boxers can eat any type of dog food. The more expensive dog foods have a lot of nutrition in them. Dogs often get fuller off a lesser amount of food when they eat more expensive brands.