There is no logic in the posted code.
You have to clear your HTML and the <form> tag.
Then go for PHP code.
For example, your HTML code should look like this.
Code:
<body>
<form action="animals.php" method="post">
Select an animal:
<select name="animal">
<option value="dog">Dog</option>
<option value="cat">Cat</option>
<option value="horse">Horse</option>
</select>
</form>
</body>
</html>