Yes, I'm aware of that, but I've been back and forth with whether to continue feeding high protein or not because he puts on weight very easily (right now i'm feeding horizon legacy), I reduced the ammount to 1/2 cup in the morning with 2 tbsps of canned mixed in and same in the evening, which is very little for a dog his size (67 lbs), I did notice that he begs a lot now, like the small ammount just doesent satisfy him, but then again, it could be something that he learned from being fed table food.
I also noticed that he's been a bit sleepy lately, had the blood tests done and everything came out fine, he's active in the evening, but he seems to run of of steam on walks, which is highly unusual. I've read someplace here that theres too much of a particular amino acid( trytophan I think? ) that may cause the dog to act very subdued.
I really cannot be certain whether the food is the culprit, but its worth a shot.