Dogs are generally thought of as carnivores. In fact, they are omnivores. IN the wild they will eat anything they can find. Your dog will manage perfectly well on a vegan diet. Of course, you need to make sure that your dog is eating a balanced diet whether you feed him meat or not. If your dog is already on a meat diet, you may find your dog will be a bit reluctant to change. After a short time he will be fine.
Here are some vegan recipes which will help you make your own dog food,
Made from simple wholesome ingredients like rice, quinoa and sweet potatoes/
Build this self-filling water bowl and fill your dog's bowl less frequently.
This recipe is vegan, gluten free and oil free.
Check out the step by step instructions in the video.