A React app renders a pet-selection menu with a labeled dropdown. The component tracks the selected animal in state and logs each change to the console. Options are defined in a static array and passed to a reusable `Dropdown` component, which builds a native `<select>` element with `<option>` children. The example uses React's `useState` hook and the ReactDOM `render` method, along with the component's `onSelectedValueChange` callback to update the selection.