What is my name?

I have been in my new house for a few months. I do not know my name yet. Sometimes, my mummy calls for 'Sunday' and sometimes she yells "Sunshine". No matter what name she announces, I will always go to her. Who knows? There may be delicious food awaiting me. Sometimes, my mummy will shake her head while the other dog will use her head to push me off. I wonder why.....

Yours Paws only,

...Who am I