How to Put your Dog on a Vegetarian Diet: Short checklist of things to be careful about.
Pets and Vegetarianism: Describes which pets can be safely fed on a vegetarian diet.
Should you keep your dog vegetarian?: Comprehensive article.
Vegetarian Dogs: Book which gives information on purchasing or home-making vegetarian dog food, its benefits, and other pet care issues. Ordering information.
VegPets: Forum for discussing issues for owners of vegetarian pets.