Before you decide to turn your dog into a vegan, keep in mind that celebrities – even the animal-loving kind – don’t necessarily know what’s best for your pet.
Dogs are carnivores. They evolved to eat meat, which is evidenced by the design of their teeth, jaws and GI tract, their inability to process plant material efficiently, and their aversion to vegetable-based meals. The decision to lead a vegetarian/vegan lifestyle is not a choice humans should force on their carnivorous pets.
Those who don’t wish to feed animal meat should consider herbivore pets (for example, horses, rabbits or guinea pigs) who thrive on plant-based diets.
Source: http://healthypets.mercola.com/sites/healthypets/archive/2012/01/19/vegetarianism-for-pets.aspx?e_cid=20120129_SNL_TPA_1
