my dog went through the same phase. i kept thinking "my they are finicky....just like the forums say." but, she wasn't that hungry as it turned out. a week later, after a nice 15 minute walk, she turbo-chowed a meal and looked up at me for more. i thought, "now, we are on to something," only to have her shut down again in a couple days.
the three things that work really well for us:
1.. patience. keep your mind open, and watch. you will pick up on your pup and adjust.
2.. walks. my pup always eats better after a nice walk.
3.. and, if all else fails, mix in a little of the canned stuff....for flavor. that was the biggest change i made, and the most successful. if boxers tend to bore easily, its very simple to buy a few flavors of canned food with some form of gravy in them. add a table spoon or two per half cup of dry food.
my girl is suddenly eating 3 cups a day w/o problems every time i put the bowl down.
as for the "switch foods" comment... all kibble is crap unless you want to spend a fortune...even the "name brands" that vets recommend. it all has tons of filler, and a lot of it has corn products. i have gone nuts reading labels and it's ALL crap according to what we are supposed to look for. if it drives you that crazy, you can supplement some raw meats from your local butcher and/or look into the BARF diets.
