Hi how old is your dog? If he is over 18 months old then look into the foods I mentioned if he is younger look for a good quality puppy food. Quite a few boxers have allergies so I would look into feeding a food that is grain free. They are also known to have cancers so I would stay away from low end brands. I feed my boxers Orijen and this is a good choice since it has no grains. Also there is Wellness Core and Innova Evo. A good place to look is dogfoodanalysis.com there you will see reviews on several brands. It gives you a good idea of what is good and not so good. Good luck!
Boxers tend to have sensitive systems. My first boxer girl seemed to do well on chicken and rice based foods so we kept her on that until she got older and needed a senior's diet.Any change gave her gas and upsets.Now our two year old boxer boy has been diagnosed with inflammatory bowel and we have been trying all sorts of hypoallergenic and novel protein foods but haven't been able to get his diet issues resolved. If your dog is healthy and you are going the route of commercial foods then look for recommended brands of food that avoid common allergens (grains, dairy, additives). Everyone has different opinions on what diets are best (raw, organic, home cooked...) If you got your dog from a breeder he or she might let you know what has been successful with his/her line of dogs. As long as your dog is thriving and seems to be doing well you probably are getting it right. Enjoy your "pup"....Boxers are the best!
I feed mine Purina Dog Chow, was told by her vet it a good choice. Lately I been looking into making her food & snacks, for hearing all the talk about dog food not being so good for her. I will stay tuned in for more info.
Right now she on Purina puppy dry and Purina dog caned mixed together, to get her to eat more for she preg.
i feed my guy purina one chicken and rice he really likes it and it seems to agree with him, for snacks i give him dried fruit which he just loves especially apricots and peaches. he loves all fruit and he gets dog treats but i prefer the healthy choice for him.
I no longer have Boxers but I will still try to help.
I think the best will probably be a whole prey model diet. If you would rather not go that route then I think there are several good commercial foods out there. Some I would suggest you look into would be Canidae, Wellness, California Naturals, Orijen, and Wysong for starters.
Boxers can have a number of probems especially depending on their breeding. I don't know the background of your dog but here is a few issues
Allergies/skin problems, dogs with allergies can often have multi allergies which means to food, plants/grass, shampoos, ect, ect Many times it is grains especially corn or wheat that gives dogs problems, they can be allergic to protien sources too.
They can also have sensitive stomach or food intolerance which will give them loose stool, gas or even continually puke up the food.
Cancer is another big issue and some foods have cancer causing preservatives and chemicals, some are also heavy in grains which is a source of carbs which help aid the growth of cancer.
If you feed your dog a great diet it doesn't guarantee your dog won't get sick or have cancer but it does reduce the risk and also makes it likely to be less severe of an issue.