I will not spoil the plot (you can go to Wikipedia for the storyline if you wish). I think it is about coming to terms with the loss of a loved one (in many forms and guises), so being fond of dogs is not a prerequisite* of seeing the film. You can click HERE for the trailer.
Edit. * Should that be 'prerequisite', I wonder? Barrett Bonden will know! BB, if you read this can you tell me which is correct? 9/3/09- see BB's reply in comment box. I had used 'requisite'.