Is it safe to feed cats and dogs a vegetarian diet?

After quitting meat for ethical, health or environmental reasons, some pet owners want their pets to join them in a plant-only diet. But is it safe to make our carnivorous felines and omnivorous pups give up meat or animal protein altogether? 

The short answer is, it’s a gray area: It’s a possibility for some pets, but not all of them. And it’s never recommended to switch your pet to a plant-based diet on your own. Plant-based diets are newer to market and the science is still developing. To make sure your pet gets enough of all the essential nutrients you’ll likely need a little help. 

https://www.livescience.com/pets-plant-based-diet