<p>
{% if breed %}
  The breed you entered is {{breed}}.
  You can update it in the form below:
{% else %}
  Please enter your breed in the form below:
{% endif %}
</p>

<form method="POST">
    {# This hidden_tag is a CSRF security feature. #}
    {{ form.hidden_tag() }}
    {{ form.breed.label }} {{ form.breed(class='some-css-class') }}
    {{ form.submit() }}
</form>