In recent years I became more aware of the high sugar and sodium content in even good quality store bought bread. Also, most store bought bread contains a long list of ingredients and preservatives I can't pronounce and never heard of.
I finally settled on using Brownberry Natural Wheat Bread in Gracie's meals. Out of all the breads available in my grocery store, it seems to contain the most healthful ingredients and the least questionable ingredients. Plus, I like the way it tastes as much as Gracie does. Yet in the last year and a half this bread has almost doubled in price!
So I started using store bought bread less and instead use more home-cooked grains in Gracie's meals (oatmeal, barley, brown rice). I also make homemade Doggie Bread much more frequently than I used to (click here for an easy Homemade Doggie Bread Recipe).
I realize you can't beat the convenience of store bought bread. Especially if you're pressed for time or taking your dog on a trip. If you do use store bought bread in your dog's meals, read the ingredients list carefully. Some wheat breads contain concentrated raisin juice. Raisins are toxic to dogs, so I wouldn't take a chance feeding my dog these breads.
According to the Brownberry Natural Wheat Bread ingredient list, the bread contains: cracked wheat, water, unbleached enriched wheat flour [flour, malted barley flour, reduced iron, niacin, thiamin mononitrite (vitamin B1), riboflavin (vitamin B2), folic acid], sugar, soybean oil, salt, yeast, cultured wheat starch, nutrient blend (tricalcium phosphate, maltodextrin, vitamin E, vitamin A, niacin, reduced iron, pyridoxine hydrochloride, riboflavin, thiamin mononitrate, folic acid, vitamin B12), grain vinegar, soy lecithin, whey, soy flour, nonfat milk.