a bad but potentially interesting idea:

make-up a blog that's supposedly written by 31 people who are part of a doggy time-share. Each of them gets the dog once a month with a person not getting the dog at all on months with only 30 days. S/he only paid half of what the rest of the time-share people paid. They blog about how the dog is doing.

Ideally, there will be a seperate blog where the dog talks about its side of the story.

When I think about it, its really similar to the plot of this movie.