Is it possible that WELLNESS Core dog food is TOO HIGH IN PROTEIN for some dogs?

Interesting question. I would really consult your vet and see what he/she says. I know for my little Cairn, the Wellness Core has too much protein. Is your dog a couch potato or does she get a ton of exercise, etc.? If you feed twice a day, perhaps you could feed her something with less protein for her second feeding.