Travelling by foot with the cows from Spain to France

My brothers will be walking by foot with the horses from Spain to France (atleast two of them), and when this dessicion was made, my mother asked me if i didnt want to do the same but then with the cows. Actually: yes, i do want to do it. Might be a lot of fun, a whole new experrience, a whole new adventure, a total different way of travelling. What do you guys think about this?