protein

Question
Hi, I have a 1 yr. old pit bull female. she weighs 53lbs. she has a sensitive stomach and were trying to find the best food for her. according to reviews about Origen, i found it to be the best and the vet said to go ahead and give it a try but I would aslo like a second opinion because the protein is very high and I am not sure if thats ok. Here are the ingredients and nutrition facts listed.
Deboned chicken, chicken meal, turkey meal, russet potato, lake whitefish, chicken fat, sweet potato, whole eggs, turkey, salmon meal, salmon and anchovy oils, salmon, natural chicken flavour, sunflower oil, sun-cured alfalfa, dried brown kelp, carrots, spinach, peas, tomatoes, apples, psyllium, dulse, glucosamine Hcl, cranberries, black currants, rosemary extract, chondroitin sulfate, sea salt.
Protein 42.0% Fat 16.0% Carbohydrate 18.0% Moisture 10.0% Fiber 3.0% Calcium (min.) 1.6% Calcium (max.) 1.8% Phosphorus (min.) 1.2% Phosphorus (max.) 1.4% Omega-6 2.0% Omega-3 0.7% Glucosamine 500 mg/kg Chondroitin 150 mg/kg Microorganisms 80M cfu/kg pH 5.0 Ash (min.) 7.0%
could you please look this over and give me your advise? Thanks so much!

Answer
It is almost impossible to access enough information about a dog food to tell how good it is.  Dog foods need 4 components, protein, fat, calories, and dribbles and drabs to bring up the vitamins and minerals to what a dog needs.  Often they contain a grain or potato to bring in some vitamins, minerals, and add a little protein and mostly carbohydrates for calories.  Not all protein is equal.  Dogs need certain minimums of different amino acids.  A food can get there 2 different ways.  Either by fairly low protein content, but very carefully balanced, or by more, but not as carefully balanced protein.  Either route can provide a good diet, with any excess being burned as calories.  The only real problem with burning excess protein is a little more work for the kidneys.  As long as your dog doesn't have kidney problems, higher protein ensures getting enough amino acids.  

I have seen both good and bad reports on every chow there is.  How many come from somebody selling something?  Who knows?  I say, Orijen is worth trying, but don't promise it will work.