Rails Search and add filters to the search - geocoder

I would like some advices on the way to add a filter , on my search form with geocoder.

I got a User model and Animal model (animals got a Type argument)
And a join table : Animal_User with Animal_ID / User_ID)

Right now, I can locate Users around a city with the choice of Kilometers around that city.That's working fine.

I would like to add the filter on the type of animal, that would be great :)

Search would look like this : London > 10KM > Filter on Type : dogs

Many thanks in advance if you have a glimpse of an idea on how to do that. You will find the search html and the controller. If you need User Model or Animal model i can post it too ( it's really standard Has_many / has_many though association)

search.html.erb

<div class="search-bar">
<%= form_tag search_path, :class => "webdesigntuts-workshop", method: :get do %>
  <%= label :user, "" %>
  <%= text_field_tag :city, params[:city], placeholder: 'City', :input_html => { :value => 'Paris' } %>

  <%= label :distance, "" %>
  <%= text_field_tag :distance, params[:distance], placeholder: 'km', :input_html => { :value => '10' } %>

  <%= submit_tag "Search" %>
<% end %>
</div>

search controller

class SearchsController < ApplicationController
    def search
    if params[:city].present?
      @searchs = User.near(params[:city], params[:distance] || 10).where("id != ?", current_user.id)
    else
      @searchs = User.all.where("id != ?", current_user.id)
    end
  end

end