What is your opinion of Vegans forcing their lifestyle to their cats and dogs?

Our pets are dogs and obviously they are carnivore in nature. So it is not good to make them vegans. But sometimes we give them boiled potatoes or boiled squash for some vegetables as per the advice of one dog breeder. But we give them not on a regular basis though. From our experience, our dogs need protein for their proper sustenance so it is meat that they need.