<a href='/dog/?owner=' + data['owner'] + '&breed="bulldog"'>Dog</a>

...
url(r'^dog/$',
        TemplateView.as_view(template_name='dog.html'),
        name='dog'),
    url(r'^ajax/dog/$',
        views.dog,
        name='ajax/dog'),
...

def dog(request):
  owner = request.GET['owner']
  LOG.info(owner)
  breed = request.GET['breed']
  LOG.info(breed)
  ...

...
  File "/mnt/virtualenv/local/lib/python2.7/site-packages/django/utils/datastructures.py", line 295, in __getitem__
    raise MultiValueDictKeyError("Key %r not found in %r" % (key, self))
MultiValueDictKeyError: "Key 'breed' not found in <QueryDict: {u'owner': [u'kevin_lawder']}>"