[Weatherlight]

You can spend plenty of time browsing sites like these:

PCRM >> Health, Vegetarian Diets and Recipes, Preventive Medicine and Nutrition, Cancer Prevention and Survival.
Vegan Outreach -- Ending Cruelty to Animals
Nutrition -- The Vegetarian Resource Group

but since you mentioned your dogs, I instantly thought of these:

Home (highly recommended)
HelpingAnimals.com // Help An Animal // Factsheets // Meatless Meals for Dogs and Cats (PETA's intro, everybody knows PETA)
Feed your companion animals a vegan diet!
plus this awesome, mostly-accurate book, Amazon.com: Obligate Carnivore: Cats, Dogs, and What it Really Means to be Vegan: Jed Gillen: Books

Have fun