So I have a input like:

<input type="text"
    name="firstname"
    id="firstname"
    placeholder="Name"
    maxlength="15"
    pattern="^[a-zA-ZąćęłńóśżźĄĆĘŁŃÓŹŻŚ]+$"
    autofocus
    required >

Now I need to add another 'validation' what detect if in this input appear one of the following words: ['dog', 'cat']

So I would like to add patern or something else what check if input pass pattern="^[a-zA-ZąćęłńóśżźĄĆĘŁŃÓŹŻŚ]+$" and do not let any word from this array ['dog', 'cat'] pass