I am guessing you may be from India based on the flag icon, Most dogs in the US are considered carnivores however I have read that in reality they are omnivores much like wolves, who eat both meat and plants, and can survive on a vegetarian diet. This is a relatively new concept for me and one I do not and likely would not follow. But one must do what they must. I have further read that most of the protein a dog will get on a vegetarian diet is thru legumes, peas, lentils, chickpeas and the like along with eggs, potatoes, grains like barley wheat and supplements and omega 3 & 6.
It has been found that dogs eating grain free, with their protein coming mainly from legumes are often affected with DCM, an often fatal heart disease. I am by no means an expert and can only write about what I have read so you will need to do your own investigations. Not being familiar with a vegetarian diet for dogs I honestly cannot recommend foods. There seems to be much information on the internet and I would do local searches.