my dee dee is on purina ha soy diet and her posts went from 76, 53 then 26 on the soy diet as soy is low in protein -- she is hypothyroid so I do not recommend soy for this reason as i am trying to see if the soy food caused her to be hypothyroid as soy can affect the thyroid protection in humans so i think it would be the same in dogs so i would recommend staying away from that even though it worked for my girls bats but dd had no symptoms of mvd just blood work showed it |