My 11 1/2 year old dog that weighs 57lbs., has arthritis and elbow displaysia. She loses her mobility during our very slow walks, and she walks very stiff. She also has a history of UTI's so my vet suggested I feed her Royal Canine SO Moderate, and I should NOT give her anything with phosperus or magnesium. Your product has phosperus in it, and I wanted to know if that amount would harm my dog. Please respond as soon as you can. Thank you.
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