The dogs are walking in the desert.
The dogs are on the beach.
Dogs are dogs. Nothing else is relevant.
exists e1 x1 x2.(n_desert(x2) & n_dog(x1) & in(e1,x2) & Actor(e1,x1) & v_walk(e1))
exists p1 x1 x2.(n_beach(x2) & n_dog(x1) & on(x1,x2))