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You are right on target. All the vets and nutritionists that I work with believe that maximum protein should be in the 20 percent range. If your dog has ever shown borderline liver or kidney values on bloodwork, they like to see it in the low 20's, tops. I feed three different foods to my three Shelties for that reason...they each have different needs. But I'm careful never to let the protein level get above the 20 percents. You generally won't see the results of cumulative kidney issues until they're older, and then it's tough to reverse.
Hey Barb, how old is Bacca? Also, how old was he when you had his thyroid tested?
I think the main question to ask yourself is - WHAT are you looking to do with your dog?
If you are just looking for a "home body" dog that goes out for the daily walk/run, plays around the house, and cuddles, then you probably DO NOT need a high protein food.
If you are looking into getting involved with dog sports such as agility, flyball, or herding ... the more active sports ... then you may want the higher protein foods ONCE YOU START training/competing.
Based on everything I've read on these high vs. low protein discussions here and the various links posted and talking to my groomer, who breeds Shelties for show and performance, I've come to this conclusion:
Protein to dogs is equivalent to Carbs for humans.
Carbs, in a human, are energy. Energy drinks, including things like Gatorade, are high in sugar because sugar IS a carbohydrate; it's energy for the human body. If you aren't participating in an event where you need the extra energy provided by the carbs then don't eat/drink them. If you do, the result is weight gain because of unburned calories.
The same can be said for dogs. Protein is energy for dogs in the same way carbs are energy for people. If they don't need the extra energy (Protein) because of some activity they are involved in, don't feed it to them. Stick with lower (mid-20%) protein foods.
I'm transitioning Edan to TOTW High Prairie formula, one of the high protein formulas, because we run agility. We train at our club twice a week plus practice at home. We also compete in agility trials. I'm HOPING the higher protein will help prevent him from being so totally worn out at the end of the day. (We were using Eagle Pack Holistic Chicken and Rice which was a 24% protein content but not grain free. I STILL highly recommend this food.) When we are no longer competing, I'll drop Edan back to a lower protein food again.
So, again, ask yourself what are you going to do with your dog and use that to guide your judgment. As you've seen, you'll NEVER really get a clear answer. The "what are we going to do" question at least gives you a foundation to base your decision on. Whether you go with high or low protein, if you select a higher quality food, you really can't go wrong.
(NOTE: This is all assuming no known medical issues. Medical issues change the scenario; and you can only make decisions based on KNOWN medical issues. If you try to make a decision based on "what ifs" you'll never get anywhere. Make a decision and adjust if something comes up.)

Excellent post, I appreciated the info and read![]()