If no one ever ate meat again in this world never used animals for clothing ect.?

What woul happen when all those deer start poping out in the frount of peoples cars, What would happen if we all just turn are dogs lose and are cats and pets free cause those groups that don't want people to have pets, hay and make it against the law to euthanize animals to cause thats cruel too, um how yah gonna teach the coyotes and the lions to eat vegatables there cruel to the kill, um how yah gonna stop the eagle from eating that mouse... Its part of nature.. Or that fish eating the minnow, gonna teach them to eat vegatation... WOuld are world not be over run in animals then..