Create multiple objects in 1 form

I have an model in my rails app called Dog. I want to create a form
where I can create an arbitrary amount of dogs with one request.

Here's the default for creating a dog form:

<h1>New dog</h1>

<% form_for(@dog) do |f| %>
  <%= f.error_messages %>
    <%= f.label :confirmations %><br />
    <%= f.text_field :confirmations %>
    <%= f.label :name%><br />
    <%= f.text_field :name%>
    <%= f.submit 'Create' %>
<% end %>

with this controller code:

  def new

    respond_to do |format|
      format.html # new.html.erb
      format.xml { render :xml => @dog}

  def create

    respond_to do |format|
      if @
        flash[:notice] = 'dog was successfully created.'
        format.html { redirect_to(@ dog) }
        format.xml { render :xml => @ dog, :status
=> :created, :location => @ dog}
        format.html { render :action => "new" }
        format.xml { render :xml => @ dog.errors, :status
=> :unprocessable_entity }

So here I have a form where I can create a dog in the DB. How do I
create a form (and the respective controller code) to create 2 or 3

While I'm admittedly a rails newcomer--and probably destined to go back
to PHP if I can't get some traction on some of my own forms issues--I
can think of two practical ways to go about this:

    1. Have a successful create add some feedback to flash[:notice] and
       redirect to another dog entry form. As long as the session (or
       some other mechanism) is populating a foreign key into each dog
       object so you can find the records again, you could do this an
       arbitrary number of times.

    2. Use AJAX to get the number of dogs you want to enter, and then
       create a nested form for each one.

Maybe some of the more experienced rails folk will have better
suggestions for you.