I forgot to mention that you can buy vegetarian kibble. That's what I feed Lady combined with homecooked (brown rice, cottage cheese and either chicken breast, tilapia or eggs as her protein). She has liver damage from nine years of seizure medication.
Avoderm has a vegetarian formula:
AvoDerm Natural Vegetarian Adult Dog Food
Natures Recipe also has a vegetarian formula:
Nature's Recipe Vegetarian Canine Formula - Food Center - Dog - PetSmart
Both Petco and Petsmart carry these brands.