Validate Input
<html>
    <head></head>
    <body>
        <h1>Ryan's vet shop</h1>
        <label>What sound does your pet make?
            <!--Try changing oninput to onchange-->
            <input type="text" id="sound-input" oninput="checkSound()">
        </label>
        <p id="result-paragraph"></p>
        <script>
            const soundInput = document.getElementById("sound-input");
            const resultParagraph = document.getElementById("result-paragraph");
            
            const recognizedSounds = [
                "moo", "bark", "meow",
                "hiss", "ribbit"
            ]
        
            function checkSound() {
                for(const recognizedSound of recognizedSounds) {
                    if(soundInput.value === recognizedSound) {
                        resultParagraph.innerText = "Oh I know that one";
                        return;
                    }
                }
                resultParagraph.innerText = "Your pet is broken";
            }
        </script>
    </body>
</html>