Dogs are carnivorous, so they lack the ability to break down vegetables and fruit like herbivorous animals can. (smartdogowners.com)
Soy and alfalfa are commonly included in feeds for many herbivorous animals under human care, however these diets have high levels of phytoestrogens that disrupt normal hormone functions in some species. (sciencedaily.com)
They do not manufacture amylase in their saliva, to start the break - down of carbohydrates and starches; amylase in the saliva is something omnivorous and herbivorous animals possess, but not carnivorous animals. (thewholedog.com)